[XCELR8]

Here is the dyno chart for my black supra. The peaks are 650.9 SAE rwhp, 651.2 SAE ft-lbs. I've been looking at a few other supra dyno charts and what I notice is that the hp curve is slight above the torque curve where the boost is rising (i.e. 4-5Krpms). Most I have seen have the torque significantly above the hp. Also, the hp/torque peaks are very close to each other. Again, most I have seen have the torque peak significantly below the hp peak. The chart below apparently is not smoothed.

 

[Steve Theodore]

Turbos like yours scare me! Look at how quickly it spools up (once it finally does)...not exactly my choice for a road racing car.

Of course for straight line stuff, this is one hell of a serious setup! Plus I'm sure you could always run lower boost to enjoy the twisties. Congratulations on the awesome numbers Jim!

 

[CMKIV]

Jim,

why is the curve so spikey after it gets to full boost and its pulling towards redline..
the majority of singles ive seen have always pulled smoothly to redline..


is it your boost controller?? which kind are you using??

nice #'s tho! its a beast!

-CMKIV

 

[XCELR8]

First, the chart is not as smoothed as others that I have seen. That's just a matter of the software making it more appealing. Second, most dyno charts I set don't actually show a run up to 7000 rpm. I've seen quite a few others that cut off in the mid 6K region. Look at my chart up to that point and imagine it had been software smoothed. Also, note that the peak is actually hit in the upper rpm range, another difference.

 

[RYANT]

Hey buddy very nice dyno ..To tell you the truth thats the best and truthfull dyno i ever seen here and also corrected sae...
Do you have cams on your car? how much boost was that dyno? ..

 

[RYANT]

Also what turbo are you using?

 

[XCELR8]

HKS 272 intake/exhaust cams. I believe it was holding boost at about 1.75 bar. The car did 620 rwhp several weeks ago at 1.5 bar but was running too rich then. The turbo started life as an HKS T04R. Jon of Fastrax modified it to run with a larger compressor wheel (T51), a smaller exhaust wheel, a larger bearing, etc.

[ June 05, 2001: Message edited by: XCELR8 ]

 

[Steve Theodore]

You're still gaining over 300 rwhp in about 500 rpm...that is really sudden!

Steve

Originally posted by XCELR8:
<STRONG>First, the chart is not as smoothed as others that I have seen. That's just a matter of the software making it more appealing. Second, most dyno charts I set don't actually show a run up to 7000 rpm. I've seen quite a few others that cut off in the mid 6K region. Look at my chart up to that point and imagine it had been software smoothed. Also, note that the peak is actually hit in the upper rpm range, another difference.</STRONG>

 

[jimmyP]

Good #, my to4r put down 646rwhp no cams I will run it with the 264 cams and the 3 anglevalve job also threw in 890cc inj so I will let you know on friday what it makes!

 

[XCELR8]

Good, let us know the boost level you run at too.

 

[Antivenom]

I've been looking at a few other supra dyno charts and what I notice is that the hp curve is slight above the torque curve where the boost is rising (i.e. 4-5Krpms)

Torque should always be greater than Horsepower before 5252 RPMs. (where HP and TQ are equal) After that the Horsepower should always greater. Yours is like that also? Maybe I misunderstood what you wrote.

Your TQ and HP numbers are so close becuase you are losing a lot of torque right after ~5100 rpms, If it wasn't for that slight pickup from the loss in TQ at ~6250rpms your TQ peak #'s would be higher than HP peak #'s
I don't know if this is normal?

Could you post the graph you were comparing it to?

 

[XCELR8]

Antivenom, mea culpa, you are right. I looked at the dyno chart again carefully and realized before the point where hp and torque always intersect (5252 rpms, due to the fact that hp = [torque x rpm]/5252) I was mistakenly reversing the torque and HP curves. Torque is indeed above hp before the intersection point at 5252 rpms, as it should be. The torque results are still amazing. I don't think I've seen another dyno chart for a supra where the peak hp and torque #'s are so close together. If anybody else has seen one like this, I'd like to see it posted. I have a dyno chart for a car with a similar turbo and cams that did 720 rwhp but only peaked at 640 ft-lbs. On another note, I have had others point out the jaggies in the hp curve, especially in the rpm band of 6800 to 7500 and wandering if there was timing retard. The most likely explanation is that this is the spark breaking up. The car has an HKS twinpower ignition amplifier which is supposed to help out and it would probably be worse without it. Changing the gap on the spark plugs or using differnt plugs may help out.

 

[Zerosoul]

what plugs you running? at what gap?

 

[XCELR8]

Here is the plug info I recieved today from my dad:

"The spark plugs he used while dynoing are stock Supra TT autolite plugs gapped at 0.030" and he [the tuner] said to only use them on high boost and with racing gas if you want to use them dynoing. He didn't have the number of the plugs but just ask for stock plugs for a MKIV Supra TT model. The plugs running in the car now are NGK 3330 gapped at 0.035."

Don't ask me why one would go back to the stock plugs for high boost dyno runs.

 

[houstonT]

The single guys successfully use NGK 3330's gapped at 0.028... They actually come pre gapped at 0.032, why would they be gapped up to 0.035?

Originally posted by XCELR8:
<STRONG>Here is the plug info I recieved today from my dad:

"The spark plugs he used while dynoing are stock Supra TT autolite plugs gapped at 0.030" and he [the tuner] said to only use them on high boost and with racing gas if you want to use them dynoing. He didn't have the number of the plugs but just ask for stock plugs for a MKIV Supra TT model. The plugs running in the car now are NGK 3330 gapped at 0.035."

Don't ask me why one would go back to the stock plugs for high boost dyno runs.</STRONG>

 

[XCELR8]

Don't know but that gap is what is on the car now for running on the street.

 

[KGB Supra]

Pete,
They are running an ignition amplifier on XCELR8's car. Perhaps this is why they are using a wider gap (??).

Noticed that you are selling your car. Planning on cashing in the whatever stock trend has prompted Bryce to sell his car? Or are you just gonna use the money to pick up Bryce's ride????

Regardless, I hope you get what you want for it.

Take it easy, bud.
KGB