RIPSNZ

http://forums.hybridz.org/showthread.php?p=840032#post840032

The goal of a fully streetable 9 second 240z run on fully treaded street tyres was acheived at our first proper meeting 5th Jan 2008 with an off the trailer 9.2 and a best on the day of 9.065 @ 151mph backed up with a 9.07 @ 152mph. This is well ahead of where we thought we'd be at this very early stage and obviously here at R.I.P.S we are all over the moon. I'd like to thank Avon, Dean, Jason, Paul, my Mrs (who says I love the car more than her ) My Dad, Ed and the boys who gave a hand at the strip, couldn't have done it without you. We won every race that day, loaded up and headed home with smiles from ear to ear. Now we are in the position of chasing 8s far earlier than we could have dreamed of, we've had the 240 on the hoist, checked her over and all is well, only 2 very small changes will be made, both of which 'should' see a good improvement next time out. Thanks for everyones support and kind comments during the build process and here's hoping the old 240 does us proud, Rob

The whole point of this exercise was to really test the upper limits of a common combination I sell to customers. Basicly it goes like this: Stock block, bored, decked, oil system mods, no block filling/strengthening or braces. Stock crank, ground and balanced only, no lightning or knife edging. Stock cradle. Stock used mains bolts. Normal off the shelf ACL race bearings. JUN oil pump drive. Tomei oil pump. Billet rods Forged pistons R.I.P.S racing 2wd wet sump Metal head gasket and 11mm ARP head studs. This bottom end is the next step up from our 100% stock internal motors and we have far superior bottom ends available with massive strength increases over this one, the motor in the 240z is a pretty mild street engine really, fully water cooled etc, you can hop in it and drive it 100s of miles on the street without issue and it behaves beautifully. Obviously its not just a matter of chucking it all together, there's alot of little 'tricks' I have learnt along the way. The goal is mid 8s in full street trim then we'll start upping the boost and rpm to see how she likes it. Rob

1.42 and 1.41 were the 60fts on the 2 9.0x passes. With a 630hp small block it use to run low 1.3s- 1.2s so we wern't hard out of the hole by any means, in fact there wasn't alot of boost off the line at all. I've raised the wheelie bars a bit and we are going to hit it hard off the line next time out, if it hooks up right it should be 8.70-8.80/155-157 on those same fully treaded tyres, then we'll put on the DOT M/Ts, wind up the boost and maybe add the NOS during a run. Rob

Nah, thats fine with me, give me a link to the thread on the z club site if you can, Rob

Had a fantastic day at the drags yesterday, went much better than I could have hoped for. The NZ Drag masters is a teams race meeting where they put V8 racers agains Jappa racers and they pair you up against someone running a similar time. As this is a new car we were not paired against anyone in the drag masters part of the event but we planned on enetering the 8.90 - 9.90 bracket. The aim of the day was to beat the current NZ record of 9.59 for a full street jap car. I was on fully treaded, wet weather suitable street tyres, I had full exhaust with muffler, the wastegate was plumbed back into the exhaust, NO weight was stripped from the car and no NOS was used during any run although I did try tapping a 50 shot on the transbrake to get boost up quicker but it didn't seem to make much difference. 1st run off the trailer 9.2 @ 147 Next run a 9.3 @ 147 Then the officials tell me I am now in the drag masters and have to race a tubbed, slicked mustang V8 with a very experienced driver I was sh*ting myself to say the least. I had to race the same guy 3 times and a win gave the team points towards the overall winning team (jap or V8) of the drag masters. 1st round of competition I holeshotted the guy and ran 9.337 @ 147.86 to his 9.406 @ 146.16 I decided I'd better make a few small changes to improve my time in case the guy beat me out of the hole next time. 2nd round of competition I holeshotted him again and ran a 9.077 @ 152.38 to his 9.473 @ 145.88 The timing lights didn't work so I'll post the timeslips later. 3rd round of competition he redlighted and I ran a 9.065 @ 151.09 to his 9.771 @ 139.59 All in all a great day, going to make a few more small changes and go for an 8 on the treaded tyres then go to a decent DOT tyre, wind up the boost, add the NOS and see what happens. Rob

Quick update, Very pleased with the results, I'll keep the dyno printout to myself but I can give some figures: Peek torque 2229Nm (previous best on the same dyno was 1800Nm which was in a 4070lb car that ran mid 10's) and we gained more power I'll see how we go tomorrow and post some results. Rob

Correct, buit if you devide 1000lbft by the diff ratio of 4.88 that gives 204lbft which I'm sure we all agree is no-where near what it is. As I say, I just use the dyno for comparison against other cars we've done on it, the mph on the 1/4 verses the weight of the car gives a pretty acurate measure of the power and as you say, we are only just getting started, 20psi on petrol, no NOS is nothing for this motor, once we get some good fuel in it, some decent boost and maybe the nos we'll hopefully see the mph go well into the 150s. The 146.5mph was done on 4.88s and if you listen just before the finish line you can hear the engine on the rev limiter in top: We now have 4.56s (and did have last weekend) so this problem shouldn't show up again for quite some time, Rob

I'm not sure about the 1100 odd lbft (the conversion is correct though), it really depends on which dyno you use as they all read differently, some dyno's I've been on have given over 2700Nm. We regularly show 1500-1800Nm at the wheels on the dyno we use but we also generally agree that they are 700-900bhp engines so the lbft should be in the 650-850 range I'd say. In any case, we use the dyno for comparison only against other cars run on the same dyno, you can't use our numbers as any sort of reference to numbers you may get. I'm happy that the a 10.2 @ 109 mph, hitting the brakes just after half track and with such a slippery start (1.67 60ft) is a sign that good things are bound to come soon. Rob

We are on the dyno again later today and tomorrow so I'll get a new printout. (around 1500nm @ wheels last time I think) I went to a meeting last Saturday and good news and 'average' news. All went well, it was an extreemly hot day and at 1500 feet so we were well down on power but everyone was in the same boat so we all ran slower than usual, must have been 30+ deg c amb, 40-50 track and around 50 in the car, I must have lost 2-3kg today The feild was a little smaller than they expected for such a big import battle so in their infinite wisdom the officials turned the whole meeting into a DYO. This means everyone raced everyone no matter what you drove or how fast it was. (some guys were getting 4 and 5 second head starts) We had a couple of practice runs, it was sooo slippery we just spun the tyres and ran a best 60ft of 1.700, qualified No1 for street tyres and No2 overall. Then they tell me that during competition I can't run under 10.90 or I'd be disqualified After a quick chat with the officials it was decided that under the circumstances 9.99 was the new limit, but no quicker as it was a street meeting. We ran 10.1 and 10.2 all day just doing what I had to do to win each round, then I dialed in at 9.99, got a 1.67 60ft (whooo hoo!!! lol) , 6.5 second 1/2 track @ 179kph (111mph), passed the other guy at about the 250 meter mark, hit the brakes hard and ran through with a 10.275 @ 174kph (109mph) so it was surely a 9 if I'd kept in it but I would have been eliminated. At the end of the day we won the meeting, got the $$, the wine, trophy and the certificate and I was happy that under the circumstances, without a 9.99 limit a 9.8-9.9 was probably what she would have run. Looks like we'll have to wait for a cooler, sea level track to get the mid 9, hopefully the meeting in a weeks time will get us the result. We are planning to run again this Saturday at the NZ Drag masters so I'll keep you posted, Rob

mmm, sounds like I'll have to go to a lower stall converter before too long, the NOS and antilag should liven it up no problems.

If you go back to the beginning of the thread there's a pic of the rear end. Its an alloy 9 inch head in a braced housing, 4 link, 2 way adjustable shocks etc.

Stoney, even if you have no converter slip there is no way I can see you getting 150+mph from your gears at 8500rpm. With 4.56's and 31 inch tyres I "should see" 172mph, but when you take off converter slip I'm picking more like 160 and I'm sure if I didn't hit the limiter early I would have seen 150 with a 1.9 60ft and very low boost. To gain another 10mph is no easy feet but with race fuel, decent boost and possibly NOS I'd say the 160mph will get chewed up pretty quick. As Scottie says, 411's is too tall (191mph less slip) and I don't have quick access to anything between 411 and 456 so I'll probaly go with the 456, add 2 or 300 rpm if we need it and get a set of 430's on the way for backup. Rob

You might be onto something there, 8500rpm with 31in tyres and 4.88 gears should give us 158mph yet we were on the limiter at 146.5mph, maybe we are losing some mph with such a high converter? I just used the converter the car came with and although a little 'slippy' on the street it actually drives quite nice, it sure feels like around 6000 but I havn't had it held on the transbrake yet with any significant boost so can't confirm. The 26 will have far less torque than a 30 and with a large turbo you'll need all the help you can get to get the boost in as early as possible, maybe a sacrifice in top end slip is what you'll need to get away strong, your going to have to try it and see, just as I may have to try a lower stall once we wind up the power and add NOS, Rob

Definatly can't hear anything like that?? There is 2 or 3 blips of the rev limiter at the end of 1st gear, (just as the car goes past the camera) is that what you mean? Rob

Yeah thats about what I reckon too, Problem is I'm already out of mph at 8500rpm, I'll probably get some 4.56's and get the boost sorted on the line and may add another couple of pound of boost in 2nd and 3rd (was only 20psi on the 146.5mph run) and see if we can't get an 8 without NOS, Once again, thanks for the help:icon14:

Really gutted I couldn't make it, I almost put the car on the trailer and towed her up so you guys could have a look and I could see all your cars. Next time I'll be there with bells on Rob

Cool, thanks, here's mine: 60'......1.900 330.....4.652 1/8......6.773 MPH....117.35 1000....8.586 1/4......10.126 MPH.....146.5 Something interesting, from 1/2 track we both gained about the same mph but you covered it a 10/th quicker so I'm more than happy with my first pass in the car. I've also checked the data and listened to it on the video, I hit the 8500rpm limiter just before the finish line so didn't gain any mph through the speed recording traps, maybe missed out on 1 or 2mph who knows? Once the 60's come down (really trying to do it without NOS if possible) then looks like mid-low 9's will be about right but will either have to pull 9000rpm or go to a 4.56 diff ratio. Then we'll add some NOS, or go to C16 and no NOS and see if we can't get an 8 out of the old girl. Thanks for the timeslip Mike, very helpfull

Hey Z-Gad what was your 60ft on your 8.9 run?

Good news and not so good news. Good news, 1st run ever, no boost off the line, very gentle 1.900 60ft, I ran 10.126 @ 146.5mph. 2nd run, same again, no boost off the line, 1.902 60ft, 10.28 @ 143mph Bad news: trans brake problem and leaking fluid, on the trailer going home. VERY happy with that, we had 20psi max boost, 98 BP pump gas, no NOS and obviously I was being pretty carefull on its first couple of passes ever with the RB30. Looks like once we get the 60fts down to where they should be and maybe a little more boost we'll be in the mid to low 9's pretty easy on pump gas, no NOS, Can't even imagine what it'll be like with C16 and some NOS, fookn mental Car ran pretty straight, very happy at this stage

Its a torque performance dyno and we usually find if we go to a dynapak hub dyno with our GTR's the reading is higher than we get on this dyno in 4wd on the rollers. We're were up around 1900Nm @ wheels at 17psi which is very good. One of our mid-low 10 second GTR's with a RB30 usually lays 1500-1600Nm with a small shot of NOS on this dyno so we are well ahead at this stage. We use the dyno for comparison only as every dyno reads different, I'm happy because I know on the same dyno we are making alot more power and torque at 17psi and 22psi than we have with previous RB30's and thats all that counts Rob

More time on the dyno today and we found some good gains. At 17psi, just 7500rpm and 98 pump gas we are now up to 564whp through a T400 auto and on a rolling road so well happy with that Here's a link to the 564whp dyno run: Then we decided to liven things up a bit and chuck another 5psi of boost at it and another 1000rpm, result 758whp at 22psi and 8500rpm, still on 98 pump gas, no NOS. The turbo is really only just starting to come on now, from 25-35psi we should really start laying down some goods numbers. Here's a link to the 758whp dyno run: Rob.

Yep, been playing with cam timing and giving it a bit more advance, still at 16psi we are up to 480whp. We had to come off the dyno Thursady to take the car for cert, with a 1/2 chassis its a much longer process than we thought, looks like we won't be at the drags Friday night but are now aiming for the following Sunday's test n tune then the next Friday's night wars. Here's a link to the 16psi 480whp, 7000rpm pull, you can see the front of the car comes up to a point then stops solid, we have a big wire strop on there now to stop the front wheels comming off the dyno.

Just playing around with it at the moment as we still have the running in oil etc in there but it made full boost (16psi) by 6000rpm but this may be due to the 6000rpm converter and not having enough load until then. Once we get some good oil in there and wind her up with some advance, higher rpm etc and chuck 30 pound at it who knows??? Rob