Ok, today i whent to the dyno in my n/a. I honestly was hoping for around 175-180rwhp...but i fell short. The end result is 157.5rwhp@8000rpms. And 125.1ftlbs@4750rpms. Heres a picture of the dyno graph. Notice, that it goes up and down. This was from being way to rich.

 

That's still not bad, what mods?

 

Here is a picture of the vacuum, wide band, and rpm. Look at how rich i'm running! The air/fuel ratio is in the blue.

 

Ralph Friend the owner of Excessive Motor Sports thougth that if we could of leaned it out i probably would have picked up around 20-30hp! So all you n/a guys out there, you don't need a T2 fuel pump and 550 secondarys! I'm running stock injectors, with a T2 fuel pump, and i'm loosing hp because of it. (What pressure is a T2 fuel pump and a n/a one?) But anyways, he said either get a s-afc, or a adjustable pressure regulator and come back. So thats what i'm going to do.

If you remember, i've been having a hesitation from 6-7k, this was because of the air/fuel ratios. Atleast i know what i need to get next.

Realy a good learning experience. CJ

 

It would be awesome if you could get that car up to 200 RWHP. Keep us posted.

 

Told you people. no one listens to me

That woulda been nice if you did pick up the 30 hp, I would have been damn close with my 18x guess

 

Well, i just need to come up with anouther $150...then i'll have enough for a s-afc. Then to save up for the dyno time....I hate being broke. CJ

 

That's pretty good number and you can probably get another 25 hp if you lean it out..
what type of port do you have?? street,bridge,PP,

 

Its what Rob at Pineapple Racing would call a mild street port. I wanted a stock idle, still pass emissions, and get better fuel milage. I was dissapointed, with the overall results, but encouraged by the air fuel ratios. CJ

 

your #s are a bit shy and aren't you suppose to start recording in 4th gear around 3000rpms (1:1 ratio) ??

157 * 15%loss = ~181 fwHP
125 * 15%loss = ~144 fw ft-lbs torque.

 

Yo,


How do they hook up the wideband O2 sensor? Pull your regular one and stick it in there? Or an exhaust probe? I'll be dyno'ing my GTUs at the end of the month...

I wanna hit 160!!

KS
1989 GTUs "C'mon 160!"

 

Ralph just said that it just puts pro-longed stress on the engine, and that 3rd gear just makes it a little easier. After all, the dyno is loaded with the weight of your car. And keeping your car wooded from 3k to 8k rpms in 4th gear takes a little while.

Yeah, Ralph removed the stock o2 censor, and put the wide band in place. His son said that sticking it in the tail pipe, just does'nt work very well.

If i could pull out anouther 30hp out of it, i'd be at my 210flywheel goal.

Anyone wanna buy a blow up peripheral port rotor housing for $150?? How about a spare tire for a 2nd gen for $150? I have two in stock ....How about used spark plugs. Origonal spark plugs out of a 1990 Rx-7 with 123k mile on them. Work great. $150 Obo.

Later, CJ

 

whats up with the 0 hp up to 2700 rpms, did you drop the clutch on the dyno???

Justin

 

That is were you start the Run

Ralphs Sun

 

He just had the dyno setup so that when i crossed a certain mph, the recording would start. BTW. Its a very, very nice dyno.

If any of you local guys get a chance, stop by and check out his 3rd gen. Damn that thing is awesome. 514rwhp@22psi!! And the thing is gonna go up to 28!! That thing will just be insane. CJ

 

Yep, same here - sorta like banging your head against the wall, huh?

I just let them waste gas!



-Ted

 

I thought you were waiting to get the S-AFC before dyno session. Damn, I really wanted to see how much HP increase from leaning it out. Hope you can get $$ for dyno time and S-afc soon :-). I have heard torque #s will be higher dynoing in 3rd and HP highest in 4th (locked trans.)

 

Keep in mind guys, i showed you the best hp run, and the richest o2 readings. (Thats all i have.) The 157 run was just a tad bit leaner...not much but still leaner. CJ

 

At the very least, you HP doesn't drop before 8K, that good in my book!!

 

So mild street port and the following mods:

Just so we know for people (like myself) trying to build a strong motor.

You using stock VDI/ports activation?

 

Ya, the people that have actually TUNED their cars on a dyno, or used a wideband sensor are the ones among us to finally beleive that we DON'T need more fuel!!! The leaner mixture burns hotter and faster!!
Too lean will kill an engine quickly though.
More fuel is required only for more boost in a turbo... where pre-ignition avoidance is a factor. (more fuel=less detonation)
BTW- Not too bad numbers considering its an N/A with (here's the biggie-) stock programming!!
(Maybe you should try your spare ECU... Ooops... just kidding! - I'
ll send it soon)
I think 180-190 is definately realistic with tuning.

I see you have an regular A/F gauge- Do you find it useless now after seeing the wideband results??


**Million dollar question- for an N/A**
What A/F ratio are they ideally looking for on the dyno?
-I've got an S-AFC, and my wideband is coming soon....

 

Yeah, i'm using the stock vdi system/6 ports. Except for the pinepple sleeves.

It might have even kept on making hp beyond 8k, but i did'nt feel like pushing it, seeing that the car was'nt running right in the first place.

Maybe that ecu will help bambam? Who knows? CJ

 

wide band is an extra 50 dollars. I think iw ill stay with normal. My car is too slow to tune anyway...

 

Could it be inadequate spark that's causing a rich condition above 6K? Maybe it could use two Hi-6 instead of one(if that's what you're running). Keith had a write up on that recently and was quite thrilled with new found power at the upper end.

 

spark won't shange fuel mixture, ka8legend. however better spark will more easily ignite a really shitty mixture. if you have a crap tuning, then you'll see more gains than if your mixtures are tuned properly.

hey pp13bnos, i can tell you how much leaner you'd run with the stock pump - NONE - fuel pressure is determined by the regulator, not the pump... UNLESS the stock fuel pump is too small for your power (about 185ish flywheel HP?) in which case you'll obviously run lean as the pump runs out of volume.