Supra horsepower after mods...

I met a guy that was raving about his 94 supra that it had 425+ horsepower. Now I know these supra's are fast and all but that number seemed outrageous so correct me if I am wrong. He has a 94 supra, with a 1998 supra TT motor. All he has for mods is cold air intake, 3" downpipe, no cat. and a boost controller. Can someone tell me how much this will add to the stock 320 horsepower supra?? I can't imagine over 40-50 horse but I could be way off. Thanks

it better be making that kind of power. a bpu++ supra will make between 375-430 whp. they can also make over 800whp on stock block. 425hp supras are very common.

I dont know if its completly true, but I do know that Supras can have BIG power on stock turbos, and engine. Like say if I added, a exhaust manifold, exhaust system, intercooler upgrade, and overboost the turbos you can get A LOT.

downpipe, fmic, cat-back, intake, bcc, 18psi= over 375whp.

I know on MK3s that just by doing intake and full 3" exhaust without cats will take you from 230 to 300hp..and I imagine that it should be closer to 100hp on an MKIV because the two turbos will spool quicker than the 1 on the MK3 would since they're both smaller. And I want to say people use bigger diameters on the MKIVs because of the two turbos..4" I think is the norm on them.

no way 4" dp on stock twins is stupid. 3"-3.5" would be ok but 4 inch if you are making over 800hp.

maybe it was 3" downpipe going into 4" piping...my friend has an mk4 don't remember everything about it :-P

but i know for an mk3 3" mandrel is what is desired.

um Hale, are u sure an intake and a full 3 inch exhaust with no cats will give a 70 hp to an mk3? that seems way way WAY too much? and if that was on an mk4, it will add 100 hp? i'm almost certain that the intake and exhaust will not add even close to that much hp. supposily a downpipe and exhaust on one site i seen says those two together will add 30 hp, so an intake will not add 40 hp.

i dont think even running a straight pipe with no cats or muffler would get 70hp. intakes only add about 10hp. dp can give 40hp + quicker spool + added boost. a cat-back give ~10hp. intakes can add some good hp but only with some serious tuning, removing stock maf and adding aem. this isnt really worth the effort though.

There is no possible way for him to make 425+ HP on those mods and here's why.

The boost levels on the MKIV supras (93.5-98) is electronicly controlled. There is no way you can go past the regulated amount of boost which is around 12-14psi. An intake, full exhaust, and a boost controller will make roughly 316 HP to the ground, I say roughly because not all cars are the same.

Second reason, the stock side mount intercooler is capable of holding up to 720 is the most I've seen, but that is with an AEM stand alone fuel management system tuned to perfection, along with several other modifications done to the car. A factory sidemount intercooler will hold around what he is telling you but without some type of fuel controller like a SAFC or stand alone, he will not be able to control his fuel curve and will run too rich or too lean and will hit fuel cut on the amount of boost he says he is running. All of these problems I have come across with my own car and all have to be fixed before you can even crank the boost up at all. I'm calling B.S. on this guy for sure. But hey, that's just my 2 cents.

wow ok "no way to go past 12-14psi" its called a bcc buddy. if no supra could pass 14psi then how would they make 1000hp? 400+bhp is possible with dp, catback, 18psi.

I'm not dis-agreeing with you for the love of god, I was stating that on the mods the guy says he has, there is no way to go past 12-14 psi WITHOUT other mods. calm down.

what i notice with supra owners is that when listing their mods they dont say if they have a bcc because either they forget about it because it doenst add any power or it is understood that they have a bcc already. if hes boosting 18psi then you can assume he has a fcd or bcc.

Your right. The thing is is that when people have a bpu kit and they're boasting about how bad ass their supra is, most people when showboating their car will name every single thing they have...and sometimes even more. I agree, not all people remember. When you look at the numbers the guy gave him. He said that he's putting down 425+ HP and he's untuned. My car when I had that same setup was dynoing 357hp TUNED! I'm calling bullshit that the guy is saying he's putting down that much. It's simple common sense when you break down the upgrades he's got. An intake and full exhaust will put a MKIV supra to 316HP to the ground, an intercoler, depending on size and what not can add possible 35-40 hp. Even if you have a bcc and boost controller on c-16 at 21psi which is maxing out stock injectors, fuel pump, and turbos, you still can't break 400 hp. Each pound of boost in roughly 10 hp, you do the math. btw, 320hp that is advertised when the MKIV supra weas released was to the flywheel which comes out to roughly 280 to the ground. Class dismissed :)

he never said he was "putting down" (to the wheels) 425hp he said he was making 425hp (crank). i know quite a few people who have got 50+whp from a fmic. and btw about your last comment. there was a guy on sf who posted a dyno chart of his stock supra which made ~290whp. the supra was slightly underrated. or it has a very good drive train and losses less than 20%. my car easily makes 400hp (crank) with just catback dp and vsv mod.

Again, I'm not arguring with you, the simple fact is that there is no way you can produce that amount of power with out tuning on his car. He would need some type of fuel computer to tune his fuel curve. Every car that ever leaves a production line is already rich as hell, everyone know when you run rich, you lose power. If he even tries to cut his boost up without a Boost Cut Defenser he will hit boost/fuel cut. He would need a SAFC to compensate his fuel curve or a stand alone. I know that if I spent 1200-1500 dollars on something for my car, I'd make damn sure I mentioned it when giving my mods. I understand that not all cars are the same, some react differently than others, also when running a dyno other things depend such as weather alone. The simple fact is that with the mods he listed alone, there is no way he can produce that amount of power, to the crank or wheels! Not trying to start a arguement with you but I doubt your car is making 400hp to the crank on your mods as well, but I would love to see a video of a dyno run or a dyno sheet, sounds like your car was built on a wednesday. could you post a video please?

flyinMKIV.. do you own a ragged out car. Do you have a lot of miles on your car (and by a lot I mean more than 200K)? Or is your motor just weak? :eek7:

Most mkiv owners who do the above mods along with the forgettable BCC/FCD have put down an untuned 380-430 RWHP.

In fact I've put down 409 RWHP (stock intercooler) without any tuning. With proper tuning I should be able to get another 60-90 RWHP without getting the AEM ECU.

The numbers you state are way low for the car. Is it new math? :sly:

Class is back in session :naughty:

Regards


Driving a Supra until the lottery money comes in for a McLaren GT

lol, kid. do the math. A stock TT supra produces 320HP to the flywheel. After the loss of power through the flywheel, what do you get? you can say it, don't be shy. Next time you want to talk about how power you make, why not do a little bit of research. Go back to the forums where people actually believe the crap your throwing out here please, ethier that or go read up on your information.

KID? Funny.. I have probably owned my mkiv longer than you've had your driver's license. And I've probably been driving longer than you've been able to walk.

Read my post. It clearly states 409 dyno'd HP at the wheels with BPU mods.. stock intercooler. And that is considered on the low end of the scale. With these mods.. it equates to 475-490 crank HP.

Someone how I have a feeling your car is not modded correctly..either that or you have issues since you can't accept the fact that people CAN make that kind of HP. Or you're keyboard racing.

Let me ask you this: What can't you accept? The fact that a lot of us who are running Stage 4.5 (BPU +) are putting down 400+ RWHP? OR the fact that you're not?

Intake, DP, Exhaust, BBC/FCD, and Boost controller can get you ~400 RWHP. There are too many that have done so to be "wishful thinkers." I've personally set up enough meets where we gather enough mkiv's with BPU mods and they all put down 390-430 RWHP.

BTW: I'm not trying to be an a&&.. just stating the facts. If you have an issue with the facts.. put the theories down and go to some dyno meets. You'll see more people and figure out what they're doing and what you're not.

Happy tuning.