UR50SLO

Absolutly right... I had a guy with a turbo Maxima bring it over because it would not idle right.. kind of like a huge cam in it.. AFR's all over. I took the maf out of the charged side (right by a bend) and stuck it on the inlet side where the air filter was and it was glas smooth. MAF cars are VERY Sensitive in deed. Well.. first off carbs are junk.. Lol.. but if you take a squirt bottle and put it in a streem pattern (not mist) and go spray it.. big drops right? Go over to a screen door and spray it through the screen... it breaks up the droplets into a mist for you! Imagine that with high velocisty going through it... It's not fuel injection mind you but it helps atomize the fuel..... Since liquid fuel won't burn. ~Scott

Anytime you want to come up on a weekend Rags and we'll tune on your car that'd be fine with me... it's fun! You'd need to send me a list of what all's done with it now and what your goals are so we can set in place parts to make it happen. There's been stock block/ECM car's in the 9's before! Most guy's with turbo/downpipe/Fuel pump/injectors/chip can run high 11's-12's with no difference in reliability or mpg. Be glad to point you in the right direction!

I guess my point to a extent is the actual amount of gain you get from going from being able to run 93 oct pump gas with 9-1 vs the amount of $ needed to support a 12-1 engine with race fuel does not make sense for the small gain in Hp. On a boosted engine which is all I do here...... your limited by detonation. Boost presure won't kill a engine... Detonation will. I've seen guy's with GN's/Sy/Ty's/WRX's ect put ALOT of good parts and money into their cars but neglect the tune. They end up wouding the engine or just running slow times. Every engine will work with boost. It's a matter of being able to control the fuel and timing correctly and have a safe tune. If you take the Maxima as a example and go from 16.90's@78mph to 13.40's@108mph With no real internal changes and get better fuel mileage.. I don't see how to disagree with a cheap turbo system. I used parts that were laying around my shop to begin with. IT cost me 19.00 to boost it with 6psi. (Oil pan gasket and Brass T for oil feed) Then over the next few months I added a little more and began to perfect it as time went on and I learned more about hacking the Maxima ECU/Tuning it. I did a turbo setup on a 98 Camaro with stock Series 2 V6. He took it to the track prior to turbo.. 16.70's and at the end of last year he went 12.70@108mph on 93 fuel. That's never had a valve cover off the engine! Injectors.. my header setup and my tune. His 18yr old boy beat the heck out of it all summer. (then hit a pole) So this winter I had to get a fenedr for him and repair/paint door. Both the Max engine and the 3.8L buick's take boost very well in stock trim. A Yugo might not have that much gain.. Lol.. but it does do one heck of a job at making a engine effecient. ~Scott

No to put down what you've been working towards and all and I know this will sound wrong no matter what way I state it but the short answer is no on the high compression. http://www.popularhotrodding.com/tech/0311_phr_compression_ratio_tech/index.html

Sure... and sorry again about my one post.. had too much liquid encouragement I guess. Here are pictures of the Maxima head and the GN head. I did several on each spread out a little and all pointing toward the plug. I think the Maxima head just happens to be perfect for this procedure and uses the grooves very well. The GN head works good as well but the downpipe is hot to the touch... but still cooler than any other GN downpipe I've ever come across. BTW.. I just use a triangle style rat tail file and do it by hand. THen smooth it with sand paper so there are no rough edges. Hope that helps, Scott Pic's*

Sorry I got mouthy last night I'm normally very mild on boards and discuss this stuff back and forth with no problem. The Maxima had 181,000mi on it when I turbo'd it. I ran 6psi for awhile all stock and kept evolving the setup as time went on. I changed a few other little things when I had a head gasket let go at 199,000. I was expecting it to be "Blown Out" Like GN's do.. but it was a hair line part that let go just from old gaskets. All the metal/rubber intake gaskets broke apart like uncooked spagetti. So.. It needed done. When I had the heads off is when I did the grooves,some mild port work to the intake and ballanced the air flow in the plenum. I know the exhaust temps... the timing I could run and the AFR's during lean cruze were very different from before and I can't explain it from intake/exhaust ports or plenum being ballanced. For some reason it makes more power at WOT with 10.8-9AFR than Mid 11's AFR. Very noticable difference. I run in the mid 15'sAFR to low 16s at highway speeds/crusing around. I open loop tuned the car to acheive that AFR. Since the narrow band tends to toggle 14.4-14.9 (On wideband with all above) You can really hold your hand on the downpipe when it's running at idle and it will only be luke warm 117deg.(lazer heat gun) Most guy's think I want to burn their hand.. So I'll put mine on there first. It's funny. With out the current 3" downpipe it went 13.40@107mph. I can't launch a FWD car... But the MPH tells me it's making good power. It has 245,000mi on the stock engine (with the headgaskets done at 199,000) With the Camaro... Other GN guys are running similar setups as mine but have to run Alky or Meth to get the times I'm at on 93 pump gas. As far as I know if I make 9.90's this spring If I'm not the only one I'll be one of 5 or so. There's a thread on turbobuick about the fastest 93/alky cars and I'm there with out alky. I can't see how a few hundred lbs between their cars and mine .2-.3ths can explain it either. My under hood temps are very low. Every combustion chamber is different and the grooves work better on some than others. It's experimenting with it. My take on it is with the grooves when the plug fires the flame front is able to get under the shelf of the flat part quicker and more complete than with out the grooves... along with keeping the air/fuel turbulent/suspended. There is less heat in the exhaust because the fuel that is in the chamber got burnt/used and is not then dumped into a hot exhaust pipe/header to continue to burn in the tubes (what would be left) Since there will not be 100% of the fuel burnt in the chamber what isn't burnt go's into the header/exhaust and is burnt or expelled there Which creates more heat. The less effecent the burn in the chamber the hotter the exhaust will be. (Flat tops/dish) work better since there is no blockage like a dome piston has. (Agreed Rsicard) Two things on MAF's... Screens need to be left in as you said to even/streighen the air coming in to the sensor. If you put a MAF on the charged side and have a bend before it .... it'll be very tough to tune.. at LEAST 6" streight before the MAF if on charged side... I try when ever possible to put it on the non charged side. David Vizard is a good wealth of info and results.. very good reading. I'm constantly reading and learning/experimenting. I don't go to Dyno's. It's just a number. My MPH in the 1/4mi will tell me how much power I'm making and if it made a difference. Your ET is variable on launch/traction but your MPH will be a steady marker of if your changes made a difference. Sorry for getting on the defence ~Scott

Amen... I don't see you guy's able to run low 10's on 93 octane fuel on drag radials with 250cid. I'm no beginer tuner or novice engine builder. I've been doing this long enough to know when somthing makes a difference and when it doesn't. Ever put a screen under your carb? It's worth a solid .4thenths in the 1/4mi on a sbc. Smoother idle better mpg. Oh.. but that's another "Snake Oil" treatment. I see. If I didn't get the results from doing these grooves then I'd say I didn't see any gains. But I honestly did. Before and after... Amazing. The Maxima was more impressive than the Camaro but BOTH made a difference. High Compression does not make Tons of Horse Power. Period. Not enough to make a seat of the pants difference. Look at articles of dyno results if your a "Dyno" guy Raising compression from 9-1 to 12-1 is like 30-50hp. Whoopie. Now you've got to run race fuel at 7-10.00/gallon. Oh.. there's a real street worthy car.. Had a local guy go from 10.5-1 to 14.5-1 I laughed and said you won't pick up anything... So we made a bet. He shaved the heads got his compression up and guess what... Not a single tenth. SBC Nova 10.50 car on the bottle. Ok.. go ahead and keep bashing me now.

Here's the link your talking about... For some reason you guy's don't seem to value my input.. That's ok http://www.popsci.com/cars/article/2004-09/obsession-mr-singhs-search-holy-grail http://somender-singh.com/ http://peswiki.com/index.php/Directory:Singh_Combustion_Chamber_Turbulence http://www.mpgresearch.com/forum/

I try to point the groove toward the spark plug if possible. I just use a hand file and mark them out some what even though the flat spot. (Like above head) I've turbo'd other VG 3.0's and even mine before the grooves you CAN NOT hold your hand on the downpipe. The idle is dead smooth. I get 25city beating the crap out of the car and 31mpg on the highway. That's better than the sticker said new with 245,000mi ! I've done this to several engines and in every case it helped. I chat with the inventor from India Sing often. I'm glad I read the article in Popular Science and experiemented with my Son's little 50cc Motorcycle one afternoon to see how amazing it really is. Try it if you don't beleve me or Sing. It doesn't cost you anything but a few hrs of hand file and sand paper. Cheapest mod there is. ~Scott. PS... I've been talking with Bernard From Canada (Very sharp Silver 280)for a LONG time. He wanted me to come over here and post my thoughts. Helped me with my programing on the Maxima. Coooool Dude.!!!!!

Hello... Scott here in Indiana... I found that the grooves do work in everything I've put them into. First is my 89 Turbo maxima with a VG engine. Here's the pictures of the inside of my head with the dimond cuts in them. My car's been 13.40's@108mph with only 13psi on 93oct. No Knock! 245,000mi on stock engine. 60,000mi turbo'd. THe downpipe is so cool you can touch it while running at idle no matter how long it's been running! I freak people out with it. Last year my fender was 145degrees and my downpipe was 117deg when running (With lazer heat gun) I'd be glad to share that with those guys if you want me to. Second is my 86 Camaro with Buick GN engine. I grooved the allum. aftermarket heads and have been 10.32@133mph on 93 with no alky/meth. On a Drag radial tire and a soft 7psi lanuch (1.51 60's) Take care Scott.