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why is my mph low with a 650hp hatch

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Old Aug 24, 2006 | 09:14 AM
  #1  
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Default why is my mph low with a 650hp hatch

I had dyno my hatch and got 650hp and went to the track and had a couple of 10sec runs but for some reason they all were in the 120mph range the highest mph i got was 10.8 at 137 i ran again 10.6 at 126 these runs are on 24.5 mh slicks.
I put street tires on and ran 11.1 at 132 back to back i don't know why my mph is so low,i even did a compresion test they all were above 174 it's 9:1 compresion if someone could give me some advise it would help alot thanks
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Old Aug 24, 2006 | 09:21 AM
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Default Re: why is my mph low with a 650hp hatch (The Jacko)

What turbo do you have and what dyno was it dynoed on?
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Old Aug 24, 2006 | 10:04 AM
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Default Re: why is my mph low with a 650hp hatch (tony1)

gt4067 and it was a dynomite dyno
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Old Aug 24, 2006 | 10:35 AM
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Default Re: why is my mph low with a 650hp hatch (The Jacko)

maybe that dyno i reading 70whp or so off at 650whp in a hatch with full interior should trap lease140+ mph with a decent reiver
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Old Aug 24, 2006 | 10:48 AM
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Default Re: why is my mph low with a 650hp hatch (The Jacko)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Jacko &raquo;</TD></TR><TR><TD CLASS="quote">gt4067 and it was a dynomite dyno</TD></TR></TABLE>

The Dynomite actually reads pretty conservative.
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Old Aug 24, 2006 | 11:29 AM
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Default Re: why is my mph low with a 650hp hatch (ninesecrx)

What Gearing and final drive do you have? and whats the weight on the car....

those three things play a major roll in mph...
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Old Aug 24, 2006 | 12:10 PM
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Default Re: why is my mph low with a 650hp hatch (Aggressive Racing)

something doesnt not sound right at all i went 10.59@137 in a 2750lbs car and i was making low 500's
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Old Aug 24, 2006 | 12:29 PM
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Default Re: why is my mph low with a 650hp hatch (vaporboy12)

try and get some datalogs if you can
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Old Aug 24, 2006 | 01:34 PM
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Default Re: why is my mph low with a 650hp hatch (vaporboy12)

you make me want to cry good job on your times <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vaporboy12 &raquo;</TD></TR><TR><TD CLASS="quote">something doesnt not sound right at all i went 10.59@137 in a 2750lbs car and i was making low 500's
</TD></TR></TABLE>
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Old Aug 24, 2006 | 01:46 PM
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Default Re: why is my mph low with a 650hp hatch (TURBO4drTypeR)

i went 9.7@152.9 @ 650 whp stock gsr trans at 2500lbs


easist thing to do is go throw it on another dyno.....ive come to the conclusion that 90% of dyno readings are just crap.
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Old Aug 24, 2006 | 04:21 PM
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Default Re: why is my mph low with a 650hp hatch (The Jacko)

I know of one shop near ours with the exact same dyno and they dyno'd a customers car and it made 498rwhp. On ours it made 395rwhp with the same tune.

It's easy to change the #'s around. Makes the customers happy until they go to the track.

We just like to be honest and have an accurate tuning tool.
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Old Aug 24, 2006 | 07:28 PM
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Default Re: why is my mph low with a 650hp hatch (backpurge)

yes it is very east to change dyno # to make customers happy. we dont do that but we have customers come to us with a # from a dyno jet or other dynos we put them on our mustang dyno & they see lower power. 1 big reason for that is our dyno has real driving feed back so u get a more real #. we normaly add 14% of ther whp & it comes out t what they made on dyno jet.

so your 650 is more like 559.

u got big prob with your speed im trapping those mph with 370whp in my teg on dot drags.
does the car fell like it pulling hard up top. if not your ignition might be starting to fail or u need to upgrade
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Old Aug 24, 2006 | 07:34 PM
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Default Re: why is my mph low with a 650hp hatch (Aggressive Racing)

gsr tranny and the car weights 2490 with me in it
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Old Aug 24, 2006 | 07:41 PM
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Default Re: why is my mph low with a 650hp hatch (ALL IMPORT)

actually the car doesn't feel that crazy on top end.I have stock distributor and blaster ss coil
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Old Aug 24, 2006 | 07:42 PM
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Default Re: why is my mph low with a 650hp hatch (The Jacko)

got any logs? maybe there is a really bad boost leak somewhere...
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Old Aug 24, 2006 | 07:54 PM
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Default Re: why is my mph low with a 650hp hatch (vaporboy12)

no logs sorry
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Old Aug 24, 2006 | 07:54 PM
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Default Re: why is my mph low with a 650hp hatch (vaporboy12)

same boat bro, 540 here only low 130's. we have come to the conclusion that i am not spinning the engine that high. so we will be pushing it to 10k+ this weekend. maybe 11k.
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Old Aug 24, 2006 | 07:56 PM
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Default Re: why is my mph low with a 650hp hatch (The Jacko)

if your running just the blaster coil that could be your problem u probably need a msd box to inhance the ss coil, the coil will only take u up to around 500 alone normally. ss alone can only go so far.
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Old Aug 24, 2006 | 08:01 PM
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Default Re: why is my mph low with a 650hp hatch (boostedcivicsir)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">same boat bro, 540 here only low 130's. we have come to the conclusion that i am not spinning the engine that high. so we will be pushing it to 10k+ this weekend. maybe 11k. </TD></TR></TABLE>

dame thats some revs. im trapping 128 with 17in dot drags shifting at 8200rpm 370whp. that was at the moroso event & it was the shake down of the car.
doesnt make since to me
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Old Aug 24, 2006 | 08:02 PM
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Default Re: why is my mph low with a 650hp hatch (ALL IMPORT)

mikey its a b16 go to 12 haha
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Old Aug 24, 2006 | 10:30 PM
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Default

i trap 137 with 460 whp, and no torque. stupid b16
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Old Aug 25, 2006 | 12:25 AM
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Default Re: (Garage 808 Hatch)

yea but how much does your car weigh?
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Old Aug 25, 2006 | 05:24 AM
  #23  
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Default Re: why is my mph low with a 650hp hatch (vaporboy12)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vaporboy12 &raquo;</TD></TR><TR><TD CLASS="quote">mikey its a b16 go to 12 haha</TD></TR></TABLE>

we shall see he hee. still got my fingers crossed for joes dyno tonight, if not its gonna be a long nite putting the gsr's back in.
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Old Aug 25, 2006 | 05:25 AM
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Default Re: why is my mph low with a 650hp hatch (Turbo-charged)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">easist thing to do is go throw it on another dyno.....ive come to the conclusion that 90% of dyno readings are just crap.</TD></TR></TABLE>

yours better be spot on he hee.
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Old Aug 25, 2006 | 06:50 AM
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Default Re: why is my mph low with a 650hp hatch (boostedcivicsir)

my car weight is 2600
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