Let's throw out something totally random... check your throttle cable linkage and be sure it's fully opening when you press your pedal all the way down.... I saw that happen to someone's RX-7 once and it made very little power until I tightened it up for him.

B

 

Did you do a compression check before your runs?

 

Yep. 8.5 front and 9.0 rear. Pulls 17 vac at idle.

 

I'll check it out. Goood point as I did loosen it up the other day.

 

Is that a stock motor, no port?

Jason

 

Jason, why do you ask if it is a stock port??? What should the compression be on a ported motor, or what should the vaccum be???

 

I was just curious if it was ported or not. Typically on a ported motor vac is alot lower than 17.

Jason

 

Jason, yes, it is a mild street port. Actually vac is closer to 16 as I noticed driving earlier. Maybe the dual port makes the difference on the vac.

 

Well it sounds like everyone is disappointed with my numbers. Oh well, it runs good and I am happy with it.

Maybe there is a chance that Dave's dyno read a little on the shy side.

Thanks for all the input and help, Zach

 

Zach, I think its an awsome achievement I know that Autronic will keep it reliable and smooth as hell. Dyno's at the end of the day are a good comparison tool especially if you have a few other cars to run at the same time to see where you are relative to everyone else (on the same dyno same day!).

Dont worry to much about the comments, I was only wonderign why the differences between different boost pressures, can be a heap of reasons. None of which should worry you too much with the output you have now

 

Zach,
theres noting to be dissapointed on 450+ RWHP FD! Some people think its very easy to do this or that but yet there own personal car is not working!

congrats and im sure a couple more times getting experince tuning your car you will get even higher #'s!!


screw the haters!

 

I think 450 is very good! I think most (us who have them on order) were just thinking the 40r's were going to put down more than 460 at 22psi. Congats on the numbers and thanks for posting everything. Mike

 

There are many factors in dyno numbers...tuning, porting, temp, dyno variances etc. I remeber some T-78 cars making 390 rwhp at 15 psi and others making 450 rwhp at the same boost level.

 

I agree that he should be happy with those numbers, but there is something else wrong with the car that should be fixed. He shouldnt have to run 19lbs of boost for 400HP. That is doable on pump gas and less boost.

Jason

 

I doubt that the restriction is anywhere but in the porting. It seems to be that most of the guys seeing the bigger dyno numbers have a big street port or half bp. Now I will admit that I don't know what the KDR double port is. If someone could clarify that I would greatly appreciate it. Also, Steve Kan had mentioned something a while back about needing more than just a 3" exhaust.

ZKeller, I see nothing wrong with your numbers. Most people would **** themselves if they actually rode in a 450+rwhp FD. That number is misleading. It's a lot faster than what you might think. Congrats on one hell of a job tuning your car. Drive safe bro!!

Zach

 

Its not the power of the car that makes my *** pucker when riding with Zach.... its his DRIVING!!! Zach, you may have a 3rd gen and I may have a lowly 2nd gen (who's motor has been hibernating in your garage for the past two months), but at least i don't look like a monkey F'n a football when i'm driving!!!!!!

Dyno or no dyno... since zachass got that autronic dialed in and the injection figured out, that friggin thing is scary retarded gonzo fast and the motor is smooth as a baby's butt! I've never heard any rotary idle that smooth. I saw a guy who claimed to have 500 RWHP in his rx and while it did run like a banshee, it must have had some kind of HUGE porting job or some other problem cause it idled like CRAP and stall everytime he came to a stop sign.

I think I'd be happy with those numbers on a car that runs seems to run in town just as well as at the track.

AS far as the AFR's, I was in the car for several of the last road tuning blasts before the dyno, and those numbers on the dyno sheet match what we dialed it with the In-Car Autronic wide band. (which makes me happy cause very soon it'll be zach;s turn to watch the wideband when we tune my motor..)

Might as well stop bickering about who's dyno is spot-on, cause the only way to prove it is to slap zach's car on Jason's dyno, and, zach's A.D.D. would prevent him from ever driving the whole way to Ohio before he got lost!!!!

Jason, what could be causing the motor to not put out higher RWHP's??? Timing? Turbo Problems? Drivetrain or parasitic losses from something?

 

Nah, 3" is good to around 500-550rwhp. I doubt that its the 3" exhaust causing restriction. also, one thing I notice is that the #'s were measuerd using STD. Those #'s are probably around 5% higher than the corrected #'s. I tuned 2 cars with GT40's turbo before and it looks similar to the numbers he made....

 

Both those cars had issues as well lets keep that in mind.....

 

I'll agree that 400rwhp is a hella fast car, but others have made more power at less boost with a GT35R...

https://www.rx7club.com/showthread.p...highlight=dyno

 

true, but I guess this car has problem too?

 

well isnt this thread about his car having an "issue"?

it seems like cars that people try to build themselves and then try to tune themsleves have the most problems

The key is for someone to get their car running correctly FIRST off and not try to rush things.. all 3 cars were cars that they personally try to put together and for some reason (of course) something is not right...there's no doubt a GT40R flows more than the GT35R... so any arguement about a GT40R cant put out more than the GT35R is a joke

when Zach goes back to the dyno and he goes over his notes on his last runs he will pull better #'s, no doubt. 1 dyno session from a novice (not his occupation) tuner is not a good representation

 

Actually, This thread is about his dyno result. However, people speculate that something has to be wrong with the car since the #'s were lower than expected. I guess only time will tell the true potential of the turbo kit since there'll be more and more out there to compare their notes with.

 

Whats odd is that from 12-19psi you were only gaining 5.2rwhp per one psi of boost then from 19-22 you gained 17.6rwhp per pound of boost.

The 5.2 sounds real low and the 17.6 sounds to high, it should be somehwere in the middle of there. Maybe its just real inefficient up to 19psi of boost but you did seem to be making pretty decent numbers at low boost so I doubt thats the case. As a matter of fact if you were only making 5.2rwhp per psi then you wouldnt have made anywhere near 400rwhp, even at 19psi......it just doesnt add up well

Are you sure your boost readings are correct? Maybe your gauge is wrong.

STEPHEN

 

Stephen, Wouldnt the boost readings be off the dyno run? So his gauge really does not matter if it is right or not..

 

That or the other two were tuned poorly which do you prefer?