In case you are thinking about the greddy turbo kit

[grullan]

Btw, Cory maybe you can chime in on this....but doesn't torque usually peak out on our cars around 4200-4500? His torque line really never peaks out, and if that's the case...his hp numbers are off because on most dynos hp is calculated using torque and rpm. I wish the originator of the post would come back with something.

[nissanfanatic]

Not on a dynojet. A dynojet actually measures horsepower. It uses a certain weight drum and uses speed/time to determine horsepower.. Basically, the acceleration of the drum in a certain amount of time is a measurement of horsepower. I.E. 1hp-the ability to move 33,000lbs one foot in one minute..

The fact that his torque never peaks is a sign of boost creep... Retarding timing can cause incomplete burn and a lot of unburnt fuel/oxygen can be dumped into the exhaust manifold where it will continue to burn as it enters the turbine where a lot of the energy from combustion will be applied to the turbine wheel causing even more boost..

Peak torque occurs where the engine experiences peak Volumetric efficiency.. If you do modifications such as different profile camshafts, tuned exhaust/intake manifolds and runners, head porting, redesign of the combustion chamber, and different turbocharger sizing, peak torque can happen very late in the usable RPM range of your engine, and if you take it too far, it will never happen...

[nissanfanatic]

I could probably make 300whp at 10 psi with the perfect tune and everything in the system put together perfect. But thats using 12.8 or so AFR's and the bare minimum timing retard. Spraying the IC with N2O or ice water and using a fairly large turbo.

That was the good thing about running E85. No timing retard at all up to about 10 psi. Granted, the AFR's are around 9:1 so you go through some serious fuel, but the power payoff is huge.

I don't think 300whp at 10psi will take that much... In all honesty I think I could just turn the boost down to 10psi and make 300whp..

[Edub1]

Btw, Cory maybe you can chime in on this....but doesn't torque usually peak out on our cars around 4200-4500? His torque line really never peaks out, and if that's the case...his hp numbers are off because on most dynos hp is calculated using torque and rpm. I wish the originator of the post would come back with something.

IIRC as a rule HP begins to exceed torque somewhere near 4500RPM or so.

One guy with a Mustang dyno was telling me that Dynojets are notoriously inacurate and that they seriously inflate power figures. He was saying that it's not unussual for cars to show more than 50HP less on his Mustang.

At any rate, the theoretical max for 8lbs with the rest of the motor unchanged is 239HP. 1.54ATM(155HP)=239.35HP

Perhaps if he dynoed his car at -30* it might add 60HP.

[grullan]

Thanks Cory, knew I could count on you to explain that for me. It definately looked like some major boost creep to me, I wish the originator would come back with his map. Once I dyno my car again, I'll post my dyno sheet and map on KA-T.org

[nissanfanatic]

IIRC as a rule HP begins to exceed torque somewhere near 4500RPM or so.

One guy with a Mustang dyno was telling me that Dynojets are notoriously inacurate and that they seriously inflate power figures. He was saying that it's not unussual for cars to show more than 50HP less on his Mustang.

At any rate, the theoretical max for 8lbs with the rest of the motor unchanged is 239HP. 1.54ATM(155HP)=239.35HP

Perhaps if he dynoed his car at -30* it might add 60HP.

Its 5252rpm.

Yea and dynojet guys say mustang dynos are dumb because all the people that use them just ***** about how dynojets are inaccurate.. It so ****ing retarded.. I get so sick of that ****.. Dynos are for tuning.. I'd rather tune on a mustang dyno, but when I go for numbers, I'm going to a dynojet because thats what everyone else uses..

When I want to know if my car is faster than someone else's, I'm going to the track to get a trap speed..

And your calculation isn't right.. pressure affects flow. Horsepower is proportional to flow, but you should multiply the flow of an engine by the pressure ratio because horsepower can be affected by other things. The KA has a pretty crappy tune stock, and it is most often cleared up by performance tunes when you boost the engine. If you calculate the flow of the KA at 5800rpm and factor in the 1.54 pressure ratio, you get 26lb/min which equates to 260bhp. And most of these calculations are too outdated to be accurate on today's engines.. Using these calculations as simple as we are, we assume 100%efficiency and they still average low..

[Edub1]

Thank's for the clarification.

So, you agree that even when giving the benefit of the doubt and assuming 100% efficiancy the numbers still fall quite short of what the original poster is claiming. 240, 260 whatever - but not 300 with a log manifold.

In other words we all agree -

[nissanfanatic]

Pretty much.. He kinda ****ed up when he said he was using timing to control boost IMO..

[WDRacing]

No kinda about it, simply the dumbest thing I've ever heard....and that speaks volumes

[Adikt]

hey grullan can you please post or send me your emanage maps since we have very similar setups. Email [email protected]

Thanks

[grullan]

Absolutely....give me a day or so, I'll email it to you. Also you can check out my dyno sheet on KA-T.org dyno section. You'll see two dyno sheets....the second one is the map I'll be sending you.

[Adikt]

I saw the first dyno sheet awhile ago. Very nice numbers. Did you also have the stock greddy map or atleast the password to get in there?

[S-14boy]

grullan, would you mind sending me a copy of your maps too? [email protected] or [email protected]

[grullan]

I have both the stock greddy map w/dyno sheet to go with and my final tune putting down 233whp/244tq. I'll email both to you guys, the stock map I have is unlocked from one of the greddy techs.

[Adikt]

hmm never got it. can you please send [email protected]

[HolyShiznit]

Hhahahahahahahahahahaha @ pulling timing to control boost........

Ya guys, when I am on race gas I let the timing go crazy to up my boost, but I retard it 12 degrees when I am on pump gas.

[Adikt]

still nothing... grullan you still alive?

[grullan]

yea I'm alive....work is kicking my arse. I haven't been down to my shop to grab my maps, I'll email one of my guys to see if he can send them to me. I also have two logs that will correspond with my last tune. Sorry about this guys....hopefully I'll have them in the next few hours.

[Adikt]

BUMP

grullan I could still use those maps. If you don't have them anymore can you atleast share the password to unlock the emanage