Dyno Reslults; Disapointment

[Frontwheeler]

I had a chance to put down some numbers from my Talon this weekend on the local DynoJet. I went in really hoping for 250hp, but drove away with a bruised ego. I only resistered 211 hp after some tuning with the MAFT at the end of the day. I am really disapointed about my performance when I read about Nosjunke putting down 193 hp on his stock talon. Here is my setup:

1990 Eagle Talon TSi FWD
Small 16g, ported/not clipped
ported exhaust manifold
2.5" downpipe/cat back
2.5" 02 housing with dump tube
3000gt vr4 fuel pump
2.5" UICP with crushed 1g BOV
2G throttle body elbow
3" MAFT blow through setup
ARP head studs
MBC
ACT 2100 clutch
Stock injectors and intercooler.
16lbs boost on 94 octane pump gas.
Shop temp of 70 degrees and fan on intercooler

I would like to get your guys' input on my results. Are these pretty typical numbers for a car like mine?

Would I be alright running 18lbs of boost on race gas at the track?

I appreciate any input. Thanks.

Here are the results. Base run in red, blue is after tuning.

 

[Frontwheeler]

I saw that the Dyno results cam in pretty fuzy in the forum. So here is a summary if you can't read it.

Base run: 199 hp at 5300 rpm,
224 lbs torque at 4000 rpm

After tuning A/F ratio: 211 hp at 5200 rpm
227 lbs torque at 4200 rpm

And is this normal for a DSM to have substantially more torque then hp ?

Thanks,
Wade

 

[Nosjunke]

Looks like your is real rich at higher rpms like mine. I know we don't want to make it run lean, but to lean it out a little would most likely add more power. You really have about 20 whp and 30 more lb-ft of torque than me. Flywheel at 15% drive train loss is about 243hp at the flywheel for you, so that's not to bad. Your torque is at about 261lb-ft at the flywheel. You didn't mention anything about a tune up, but when I replaced my plugs, I saw a HUGE improvement. My temp was also about 70 degrees. You also didn't mention if you have the honeycomb removed or silencer removed. Sounds like that if you don't, then there is your bottle neck. You exhaust from the manifold back sounds great. Wish I had it. I don't know what the MAFT blow through is. If you're unhappy then lets trade?

 

[DSMJim]

Wow, holy rich batman! Your A/F falls below 10.0 at 4000rpm then comes back up at 4600 and falls back off again at 5500rpm. Your into 9s:1 A/F which is WAY rich. Thats crazy you need to lean the car out big time. You should aim for 11.5 on pump gas (to start which is safe) and you would see a huge improvement in your HP. I would say 30-40 hp gain if you were to get the tuning sorted out.

 

[Frontwheeler]

DSMJim,
The run that had a 10 for A/F ration was my base run at 199 hp. The blue line is after we leaned the translator out. That got me to about 11.8 straight across all the rpms, which is right about where it is supposed to be, I think (correct me if I'm wrong). That change picked me up about 12 hp.

 

[CanadianTSi]

Something seems wrong... Are you sure you have no boost leaks and Have you changed your plugs and wires recently?

 

[Stanford]

Yeah I have seen 14b dynos in the 240+ whp range(race gas). So I think like others have said you may need a tune up or have boost leaks. You should give your Talon the once over, 211whp for a 16g on a FWD is low even for pump gas.

 

[swordfish]

Honestly... thats not bad at all for only 16psi. I mean, its still a 7.8:1 engine. 16psi is really low.

jeff

 

[Slappster]

http://www.dsmtuners.com/forums/showthread.php?s=&threadid=112048

Should've just updated that thread. Now let's look through it and see who got the closest

Why look who it is

 

[Stanford]

Originally posted by swordfish
Honestly... thats not bad at all for only 16psi. I mean, its still a 7.8:1 engine. 16psi is really low.

jeff

Good point Jeff, now that I think about it all the 16g dyno sheets I can recall were at 20+ psi and on race gas.

 

[Violater101]

I wouldn't get to dissapointed just yet. Like Jeff said, you only dyno'd @16psi. What you need to be concerned about is not peak HP per say, but how long you carry that HP accross the board imo.

 

[Slappster]

Plus the engine has a lot of miles so the compression can't be perfect for turning up the boost.

 

[Zenja]

There's probably other things that are worn out and holding you back. I don't know what.. it could be any number of things, even simple stuff like leaks or bad plugs.

Doesn't that torque curve fall off pretty fast? It seems like something is getting choked off. How's your timing, knock, etc? Maybe you're even getting phantom knock or something.

 

[kpt4321]

Don't just tune by A/F ratio, use a logger.

 

[Frontwheeler]

Yeah, datalogging equipment is next on my list of mods.

And, adressesing the sudden drop off in torque. I think you might be looking at both of the red lines for my base run. He let off early on the dyno because he could already tell it was pig rich and wasnt worth bringing it to red line. I think that is the drop off you noticed.

The car has pretty new Accel 8mm wires and pretty fresh NGK BPR6ES's gapped to Haynes's manual specs. I was told at the dyno to probably go to the BPR7ES's if I turn the boost up.

As far as boost leaks, the guy dynoing it said he would have probably noticed any major boost leaks when making pulls on the dyno. But I guess I can try VFAQ's leakdown test.

Thanks for the input guys.

 

[Frontwheeler]

Ohh, and Slappster was the closest on HP predictions for my car from my last post.

Good call.

 

[GiRtHyTaLonTsI]

I had similar mods on my fwd and i made 250 whp 250 tq @ 18 psi stock injectors. Just get a AFC and lean it out a little bit and you should make the same if not more

 

[Groomz]

Originally posted by Violater101
I wouldn't get to dissapointed just yet. Like Jeff said, you only dyno'd @16psi. What you need to be concerned about is not peak HP per say, but how long you carry that HP accross the board imo.

Listen to this guy. Let the Honda boys care about peak power numbers. DSM motors have more torque at any rpm than any Honda motor could dream of. The dyno sheet itself looks good though. Remember too that a 260hp Mustang has 3500lbs to move around, your fwd DSM has a whole lot less ( around 2600lbs ). Horsepower is nothing if its got too many pounds weighing it down.

 

[TurboSpoolinIns]

That dyno is really low. I'd chase boost leaks or see what your compression is at. There isnt' a reason why it should be that low. 240 on 16 psi is pretty typical of a similar setup.