lost hp

All technical questions and answers regarding starions, being modifications to maintenance.
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MR Bender
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lost hp

Post by MR Bender »

hey
got my car tuned it made 164bhp at 6000rpm 13psi

it is a vr4 motor stock sort of set up 3in,fmic,wolf3d,fuelpump etc


the last time i got it tuned it made 256bhp was made on 18psi where has my power gone????
the basted packed him bags and left!!!

anyway got any idea what could cause it?


thanks
Bite my shiny metal ass!!!

Russell Coight: Some of the animals are nocturnal, so the best time to see them is at night. Only you can't see them, because it's dark.
coop1er
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Post by coop1er »

What changes have been made between dynos? Where the 2 runs on the same dyno? You also are 5psi lower than last time too.
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MR Bender
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Post by MR Bender »

same dyno ,different intercooler,and ecu
and less boost
Bite my shiny metal ass!!!

Russell Coight: Some of the animals are nocturnal, so the best time to see them is at night. Only you can't see them, because it's dark.
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iXNAY
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Post by iXNAY »

boost is what makes these engine have so much power!
SR20 powered starion what have I done..... :P
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thrash
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Post by thrash »

5 psi ===> 90hp

wow lol
quest wrote:
WANTSOM wrote:Personally, I find sloppy boxes very unsatisfying. I like them tight and taught to the point that if you dont have to push to get it in then its probably too old and time to get a new one :P
don't try explaining that to her tho..... just leave. lol
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Post by redzone »

run a cat? could be partially melted.
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MR Bender
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Post by MR Bender »

no cat!
Bite my shiny metal ass!!!

Russell Coight: Some of the animals are nocturnal, so the best time to see them is at night. Only you can't see them, because it's dark.
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www.18u
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Post by www.18u »

So you are saying nothing has changed except the tune? What was the reason for the re-tuning then?
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benny
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Post by benny »

you didn't take any stickers off?? those things are worth some HP especially NOS ones they are easily 100hp on their own!
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TOMSUN
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Post by TOMSUN »

Does the car feel like it has a lot less power?

5psi will make a big difference, could be 30 to 50hp... but 90hp, that is a bit of a stretch.

Do you have the 2 dyno graphs to compare?
Where on the graph were they different in power?

Did they load the wrong map into the wolf?

Did they change the timing in the tune?
Has your base time changed some how?


*************
http://forums.austarion.com/viewtopic.p ... light=dyno

In the past you said it was a EVO3 motor, with a microtech?? (or is that a different motor running the same power?)
http://forums.austarion.com/viewtopic.p ... o&start=90
1985 JB Starion #157
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MR Bender
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Post by MR Bender »

yer i should make this a bit more clear sorry guys.
Im only going on what my other car made on the dyno with my old stuff. this is a diffrent car but it has my old turbo and manifold inj gearbox
But it has a vr4 motor not a evo 3 and less boost.
Could less boost and vr4 motor really make that much diffrents ?
And how much power does a stock vr4 make? I thort it was more than that?
Sorry i should off made it more clear :oops:
Bite my shiny metal ass!!!

Russell Coight: Some of the animals are nocturnal, so the best time to see them is at night. Only you can't see them, because it's dark.
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Post by WidebodyWoody »

Ok...


I believe the Evo3 cams would have helped, plus the bit of boost.

It is also possible that the engine is more tired, but that is just speculation
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Post by S0LJAH »

vr4 cams and evo 2/3 cams are the same
however evo 1 cams are slightly different

evo 3 motor is higher compression tho

i would say the 5 psi would account for roughly 50 hp

so u may get up around 210-220hp
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MR Bender
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Post by MR Bender »

yer cams and boost would make sence
But i would of thort it would off at least made 200atw but i spose it would make that much diff
Bite my shiny metal ass!!!

Russell Coight: Some of the animals are nocturnal, so the best time to see them is at night. Only you can't see them, because it's dark.
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www.18u
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Post by www.18u »

Mate the motors are very different. Vr4 runs a 14b turbo and the evo will be a 16g of some type with around 100 cfm more flow. your injectors are 450cc in a vr4 and a evo 1-3 will have 510s. As mentioned above the compression ratio is different, as well as the cylinder head and inlet manifold design. Bottom line is you will not make the same power on the same boost levels. Put a 16g on it and some 510's and tune it too run 20psi and it will make the numbers you require. Did you hook up the cyclone runner setup in the manifold? that will be another issue unless it is locked open.
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