TurboSouthAfrican Posted February 13, 2009 Share Posted February 13, 2009 I have a stock block and head R32 motor with a Garrett GT42R, 1000cc RC injectors, Bosch 044 pump, HKS fuel rail, Apexi FC and a few other things but absolutely stock motor. So, with no tune I put down 452 RWHP @ 21psi. I know car is running rich but did not have wideband hooked up at the dyno. Are these no's low for a car with these mods? I know with a good tune I should be able to see 20 to maybe 30 HP but again, I am being told these no's are low with a GT42R..........any input would be appreciated. Here is bad quality dyno of it. Thanks for input Larry Quote Link to comment Share on other sites More sharing options...
Italianjoe1 Posted February 13, 2009 Share Posted February 13, 2009 With a turbo that big I would expect more, but with everything stock (i'm assuming you didnt' change any manifolds or anything at all), I guess it is possible. Throwing that much boost at it and not making more power means you need to work on the airflow and efficency of the motor next. Quote Link to comment Share on other sites More sharing options...
TurboSouthAfrican Posted February 13, 2009 Author Share Posted February 13, 2009 I was expecting bigger no's too. I have read guys making mid to high 500 with similar set ups or is that bogus? Anyone here running a similar set up making bigger no's? Quote Link to comment Share on other sites More sharing options...
Almighty Wez Posted February 13, 2009 Share Posted February 13, 2009 Were you running pump gas or race? If its pump, I'm sure you could go up to 25 or so w/o a problem. Race should be 30 for that turbo to really open up and make good #s. I'm sure with more tuning, 500+ on pump would be easily done. DSM guys have been doing it for years on stock engines w/ smaller turbos. Surely the RB can make just as much, if not more, with tuning. Quote Link to comment Share on other sites More sharing options...
BirdmanZ Posted February 13, 2009 Share Posted February 13, 2009 Look for threads made by Booztd 3. His engine had cams but the head was unported. Sounds like you need a good tune. Brandon Quote Link to comment Share on other sites More sharing options...
TurboSouthAfrican Posted February 13, 2009 Author Share Posted February 13, 2009 Were you running pump gas or race? If its pump, I'm sure you could go up to 25 or so w/o a problem. Race should be 30 for that turbo to really open up and make good #s. I'm sure with more tuning, 500+ on pump would be easily done. DSM guys have been doing it for years on stock engines w/ smaller turbos. Surely the RB can make just as much, if not more, with tuning. 93 Oct. all the way, I did not want to go past 22 - 23psi, I am scared of oil pump going out, anyone run past 24psi on stock oil pump, that was my biggest concern. I have started putting a dry sump system together but is going to take some time (and money). Quote Link to comment Share on other sites More sharing options...
TurboSouthAfrican Posted February 13, 2009 Author Share Posted February 13, 2009 Look for threads made by Booztd 3. His engine had cams but the head was unported. Sounds like you need a good tune. Brandon Thanks Quote Link to comment Share on other sites More sharing options...
Almighty Wez Posted February 13, 2009 Share Posted February 13, 2009 93 Oct. all the way, I did not want to go past 22 - 23psi, I am scared of oil pump going out, anyone run past 24psi on stock oil pump, that was my biggest concern. I have started putting a dry sump system together but is going to take some time (and money). Ya I can understand the oil issue. I think even at 22 or so with a good tune you'd be closer to 500. Since I'm still learning the ins and outs of the RB, what is it about the pump that it can't take higher boost? Quote Link to comment Share on other sites More sharing options...
Racinjitter Posted February 14, 2009 Share Posted February 14, 2009 A good friend of mine is putting down 453whp with a 3076r at 15psi on a 25det. For a 26 with a 42r, you should be putting down way more than what you are. Quote Link to comment Share on other sites More sharing options...
stony Posted February 14, 2009 Share Posted February 14, 2009 93 Oct. all the way, I did not want to go past 22 - 23psi, I am scared of oil pump going out, anyone run past 24psi on stock oil pump, that was my biggest concern. I have started putting a dry sump system together but is going to take some time (and money). RPM is the issue to be worried about when it comes to the oil pump. not boost pressure or HP. On 93 oct i would make sure you have a good tune. if you dont and you start detonating you will break the stock pistons pretty quick. Quote Link to comment Share on other sites More sharing options...
eh? Posted February 17, 2009 Share Posted February 17, 2009 Seems very low for a GT42R. But you said its not tuned,not a very smart idea to run that much boost with the pfc base tune. Quote Link to comment Share on other sites More sharing options...
cheftrd Posted February 20, 2009 Share Posted February 20, 2009 You can't really compare a GT-R rear-wheel power check to that of a standard RWD car in terms of expected HP, especially on an inertial roll. The GT-R has some seriously heavy rotating mass in the transfer as well as the friction generated in the transfer's clutch pack when the fronts aren't turning. It'll behave like the viscous coupling in a mechanical fan. Then there's the oil pump that's main-shaft driven on the transfer; eating power and pumping oil into the clutch pack... All this stuff eats a lot of HP. Additionally, a GT42 is an awfully big turbo for someone looking for around 600. You'd probably make more power for the same given boost with a smaller turbo. Quote Link to comment Share on other sites More sharing options...
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