I recently had my 92 1.6L (refreshed, but stock internals) tuned and dyno'd. My base tune was extremely rich, pulled nearly 5% from each bin from the VE table. Anyways,

Garrett T25 (SR20DET)
Flyin' Miata manifold
Begi 2.25" downpipe
2.5" Magnaflow exhaust, no cat
Intercooled (18x11x3)
460cc RX-7's
steady 7psi boost (small 8psi spikes)
DIYPNP (MS2)
VTPS
No MAF

How'd I do?

 

Well, I managed 155hp/148tq on pretty much the exact same setup but with ms1, a cat, and a 3" dp, and 12psi.

So to say I'm impressed is an understatement. Skeptical would be more accurate.

edit: what gear were you in?

 

also skeptical. Those are strong numbers.

I got 225 on my 1.8 with a fairly aggressive tune, 2.5" dp, 3" exhaust, 550cc inj, ms1, 12PSI on a fairly fresh t25. (5th gear on 6spd (1:1)) stock rear end ratio. dynojet I think.
Impressive #'s, but I question the accuracy. they are a bit on the optimistic side for sure

 

It also seemed high to me. I was kind of expecting 150ish/150ish, but it pulls and drives great. They were 4th gear pulls, newly built T25, fresh injectors, valve job, 2.5" plumbing, Dynocom dyno.

 

Is this for real?? What dyno were you on?

 

Small T25, log mani, 2.25" DP, and 7-8psi = 215hp out of a 1.6?

IMPOSSIBRU

 

Not doubting you have a solid tune or that it drives well....but c'mon, 7 psi is like adding 50% more air. There's no way that 50% more air == 115% power increase. Don't think we need to go any further than that.

 

I have a small T25, full ARTech 3" exhaust, rx7 460cc injectors with a MS2 but running a 1.8L. If those numbers are accurate then just wow what a great tune

 

Even with the best tune possible that turbo is not capable of providing the airflow needed to generate that power at that psi level. That turbo at 12-14 psi could produce those numbers.

However, I noticed that the post says "hp" is OP taking his whp and transforming them to fly wheel hp?

 

On my Begi setup at 14psi with a 2554 I made 225hp on a dynojet. I am calling BS on your numbers. There is no way that you are making over 200hp with 7psi with a 1.6l.

 

That is my thought buffon, hp would be more understandable



**** OR GTFO

 

Well it is a Dynocom. I don't have much knowledge about the different types of dynamometer, but from a quick google search, Dynocom seems the most exaggerated of all the dyno's. What numbers do you guys think I should be putting down?

 

The most used in this forum are Mustang and Dynojet. Dynojet being the one that read the higher of the two.

Depending on your tune you could make from 140 to 160 whp. Try to locate a shop with a Mustang/Dynojet meter and post again

 

1.6L * 72ft.lbs * 1.48bar = 170wtq, and on a 2.25" exhaust, 72ft.lbs/atmo/L is a big stretch.

Dyno reads ~18% high, assuming it reads consistently (a pretty big assumption for a Dynocom unit).

 

Go do a Virtual Dyno street pull for us. Or maybe a 1/4 mile. Physics doesn't lie. Dynos might.

 

or just post datalog of injector Pulsewidth and dutycycle

 

Fluffy, please tell us the location of this dyno you used, and the name of the operator.

People have been boosting Miatas for over 2 decades now, and I find it impossible that a legit dyno operator would let you leave his shop believing you made that much power.

The journal bearing T25's are good for about 10whp per psi with a good manifold, big exhaust, and proper tune. In absolutely no way can they flow enough to make the 18whp per psi that your dyno sheet indicates.

 

 

at that dutycycle I made around 150~ whp on a dynojet

 

wow thats good i just had my car tuned and on the dyno its a stock 1.6 flying miata kit with the gt2560r at 10psi i made 190hp and 163tq hmmm i find these numbers very hard to believe. it was on a dynojet. using 1000cc injectors with e85