Author Topic: HELP....my so called performance slug (Read 22843 times)

86er · « **Reply #40 on:** July 03, 2006, 01:27:07 PM »

I would consider a high 13 or low 14 to be OK for your Vette

77CVT · « **Reply #41 on:** July 03, 2006, 05:21:14 PM »

Quote

Originally posted by mrvett
ok ok...i went to calder park last night in melb cause thats were mrvett lives. now all i wanted was to run a 13second quarter. all i got though was a 14.02 at 95.32mph.

now i am a little disaponited but i did feel better when my mate geoff reminded me my car didnt do that well on the dyno to begin with..haha

so i reckon it aint bad for a stock 87engine with jst a throttle body, fuel reg, exhaust, and 3.73gear ratio...but i stil want that 13 :b4 ;laugh

That's about right. Mine does 13.6 @ 101mph. With those gears you need to make it breathe and you'll nail it easy!

;42

mrvett · « **Reply #42 on:** July 03, 2006, 07:05:43 PM »

Quote

Originally posted by 87Z51
"straight through mufflers, removed the two pre cats but kept the larger cat in the middle "

Something is wrong.
My original '87 engine 120,000+ miles with no pre cats ,hiflow main cat and eliminators went 14.0 -14.1 with stock 3.07s.
Taking out the main cat dropped it to 13.9.

With a stock TPI and 3.73s I would guess you have no useful revs in 1st and be running out of revs in 3rd across the line.
What cond is your main cat in?
Does the engine rev freely under load?

honestly not sure wat cond of main cat is like? engine seems to rev alright, i thought i would run out of revs much quicker

Vette Obsessed · « **Reply #43 on:** July 04, 2006, 01:54:19 PM »

Quote

Originally posted by Garry Smith
I would consider a high 13 or low 14 to be OK for your Vette

I'd agree but with the 3.73's in an auto car I'd expect a little better - maybe consistent 13.XX ET's (with everything else being equal/up to the task).

Is it me or does the MPH look a little low guys?

What was your 60ft time mrvett?

Cameron 77C3 · « **Reply #44 on:** July 04, 2006, 02:40:36 PM »

I'm not up on these beast's but thought I would pass this on.

Some body mention to me that it might be worth checking that main cat. He said that they were known for fouling up. Just food for thought.

MADVET · « **Reply #45 on:** July 04, 2006, 03:39:19 PM »

The main cat is prone to collapsing and will progressively block the exhaust.(i had this problem once).
A mild or stock L98 should run closer to 100mph.
Could be running into the L98 out of breath zone with those 3.7 gears.

reserved · « **Reply #46 on:** July 04, 2006, 03:47:00 PM »

Quote

Originally posted by mrvett
Quote
Originally posted by BOSCHVETTE
what colour is the car ?
it must not be red,cause red ones go faster,

you could understand if it was a banana coloured rat powered vette and it lacked grunt.
(sorry can not help myself);43;43;43;43;43

boshie it is red but jst a red pig in fact ;41

:{ :{ :{:
:bold :bold :bold

Big yellow bananas
are more in demand and cost a lot more than
big red apples
what is the moral of this
;35 YELLOW is cool ;27 ;27
:pinki red;54

mrvett · « **Reply #47 on:** July 05, 2006, 01:04:22 AM »

Quote

Originally posted by Vette Obsessed
Quote
Originally posted by Garry Smith
I would consider a high 13 or low 14 to be OK for your Vette

I'd agree but with the 3.73's in an auto car I'd expect a little better - maybe consistent 13.XX ET's (with everything else being equal/up to the task).

Is it me or does the MPH look a little low guys?

What was your 60ft time mrvett?

my 60ft time was 2.014
with a quarter mile time of 14.092 @ 94.93mph

u reckon its gettin sluggish in da top end?

BOSCHVETTE · « **Reply #48 on:** July 05, 2006, 06:41:51 AM »

it is definately losing top end somewhere.put a broom stick through the cat and see how you go.

Vette Obsessed · « **Reply #49 on:** July 05, 2006, 10:17:20 AM »

Quote

Originally posted by mrvett
my 60ft time was 2.014
with a quarter mile time of 14.092 @ 94.93mph

u reckon its gettin sluggish in da top end?

In my opinion that is a good enough 60ft time for the ET you are running and for a stockish L98. I agree with Boschvette and others who say you are missing some top end.

In my opinion you should be doing around 99-100mph trap speeds.

Cameron 77C3 · « **Reply #50 on:** July 05, 2006, 10:43:59 AM »

Quote

Originally posted by BOSCHVETTE
it is definately losing top end somewhere.put a broom stick through the cat and see how you go.

Why the cat and not the dog. Sorry couldn't help it. (If ya can't beat em, join em. Inside joke. SC will come in on this one for sure) ;53

Boshy,

Can he easily remove the cat and replace it with a section of pipe to test this?

86er · « **Reply #51 on:** July 05, 2006, 12:27:27 PM »

I agree with VO here, what you need to consider the L98 with the TPI rinners will lose it in top end torque, I think that if you are running mid to high 13's & around 95 to 100 mph would be fine.
There is nothing wrong with the 0 to 60 ft time, I feel that confirms it.
PS I would not think you cat is blaocked that much if at all, as Boschie said shove a broom stick up it after you remove it & tip it upside down to see what falls out

hot 70 · « **Reply #52 on:** July 05, 2006, 12:43:40 PM »

hey cam have i got it right first push the broom up the cat & then turn it upside down & see what falls out? sounds like something that the rat pack would do.

Vette Obsessed · « **Reply #53 on:** July 05, 2006, 12:48:08 PM »

Quote

Originally posted by Cameron 77C3
Can he easily remove the cat and replace it with a section of pipe to test this?

Depends on how his exhaust was put together. Odds are for an 87 the cat is probably flanged at both ends so it would be relatively easy. Thing is, running a temporary "test pipe" instead of a cat at the track will see a performance increase over a stock cat so it won't be a true test if the stock cat is clogged (although I'm sure the visual test one can do in taking it off would be sufficient).

mrvett · « **Reply #54 on:** July 07, 2006, 04:22:03 PM »

hey guys jst lettin u kno cat has been removed dis morn..i wnted to take her to da strip 2nyt at calder but its been called off due to weather..hopefully next week

its no running no cats an straight through mufflers...it definatly louder an feels it picks up a lil better, the true test wil b at da track.

mrvett · « **Reply #55 on:** August 06, 2006, 08:41:15 PM »

hey there fellow corvette drivers jst wana lets u'z all know i was at calder park on friday night and recorded a 1/4 mile time of 13.83 at 96.37mph...very happy with this result..it probably could be a little quicker but 13s for a street car i think aint too bad ;46

77CVT · « **Reply #56 on:** August 07, 2006, 05:26:37 PM »

That's good! Looks like you got good traction.

69 DIRTY RAT · « **Reply #57 on:** August 08, 2006, 10:39:47 AM »

Good to hear you you got an improvement! It must have been fun giving her heaps down the track!

86er · « **Reply #58 on:** August 08, 2006, 12:54:36 PM »

Well done

mrvett · « **Reply #59 on:** August 08, 2006, 01:23:20 PM »

thanks boys...yea tractions was good an was great havin her out on the track again :)