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Re: Time to turn up the boost... what will it run.
[Re: dizuster]
#1441017
05/25/13 09:51 AM
05/25/13 09:51 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Got some passes in last night. I'm having trouble getting the car from Trans brake release to full boost. Takes over 1 second to get there....might have a boost leak.
Also found out that my boost gauge was off, so what I thought was 8psi last time out was really 10psi. So even I went to 13psi last night, it was only a 3psi change.
That all being said...it ran [Email]10.67@127.71!!![/Email]
The most amazing part is that we got it to leave on 8psi @ 4600rpm!
1.58 60ft actually had the front tire 2~ 3 inches up.
Just need to get the boost in quicker after the Trans brake release and the 60ft should come down.
Incredibly enough it went 10.67, 10.69, 10.69 back to back to back. Might even be able to go some rounds today!
Cool.... what did you get the timing up to... hope
you get some rounds in today 
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Re: Time to turn up the boost... what will it run.
[Re: Mr.Yuck]
#1441019
05/25/13 10:41 AM
05/25/13 10:41 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
good running I was goning to say if all goes well you should pick up 4-5 tenths. I wonder if you went up on the gear if that would help? You have 2.76's correct? maybe try 2.94's or 3.23's Does anybody make a 3.08 for an 8.75???
The shallow gear loads the turbo harder than a steeper
gear BUT he is giving up low end acceleration.. there
is a happy balance with the gears... I know he put
in what he had laying around... the gear that was
in it when I put the turbo on it was SCARY noisy
with clunks and what not(it was the worst sounding
gear I ever heard that was still rolling)
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Re: Time to turn up the boost... what will it run.
[Re: dizuster]
#1441024
05/26/13 10:28 AM
05/26/13 10:28 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Ran again yesterday. Those little tires do NOT like the sun. [Email]10.90@127...lol[/Email]
Scott... do you have adjustable rear shocks... if
you do, loosen up the extension
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Re: Time to turn up the boost... what will it run.
[Re: MR_P_BODY]
#1441025
05/26/13 11:22 AM
05/26/13 11:22 AM
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Joined: Apr 2004
Posts: 12,339
somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
Quote:
Got some passes in last night. I'm having trouble getting the car from Trans brake release to full boost. Takes over 1 second to get there....might have a boost leak.
Also found out that my boost gauge was off, so what I thought was 8psi last time out was really 10psi. So even I went to 13psi last night, it was only a 3psi change.
That all being said...it ran [Email]10.67@127.71!!![/Email]
The most amazing part is that we got it to leave on 8psi @ 4600rpm!
1.58 60ft actually had the front tire 2~ 3 inches up.
Just need to get the boost in quicker after the Trans brake release and the 60ft should come down.
Incredibly enough it went 10.67, 10.69, 10.69 back to back to back. Might even be able to go some rounds today!
Cool.... what did you get the timing up to... hope
you get some rounds in today
I agree on the timing.
my SB Chevy w/Weiand 142 blower on 93 pump and some octain boost, likes 18* initial and 36* all in at 3K....and thats at 12psi...of course I don't have the volume you do, but you are running a cooler fuel...
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Re: Time to turn up the boost... what will it run.
[Re: MR_P_BODY]
#1441026
05/26/13 01:42 PM
05/26/13 01:42 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
good running I was goning to say if all goes well you should pick up 4-5 tenths. I wonder if you went up on the gear if that would help? You have 2.76's correct? maybe try 2.94's or 3.23's Does anybody make a 3.08 for an 8.75???
The shallow gear loads the turbo harder than a steeper
gear BUT he is giving up low end acceleration.. there
is a happy balance with the gears... I know he put
in what he had laying around... the gear that was
in it when I put the turbo on it was SCARY noisy
with clunks and what not(it was the worst sounding
gear I ever heard that was still rolling)
can't believe goint to a 2.94 or 3.23 would hurt anything... did he switch to a glide???
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Re: Time to turn up the boost... what will it run.
[Re: Mr.Yuck]
#1441027
05/26/13 01:48 PM
05/26/13 01:48 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
good running I was goning to say if all goes well you should pick up 4-5 tenths. I wonder if you went up on the gear if that would help? You have 2.76's correct? maybe try 2.94's or 3.23's Does anybody make a 3.08 for an 8.75???
The shallow gear loads the turbo harder than a steeper
gear BUT he is giving up low end acceleration.. there
is a happy balance with the gears... I know he put
in what he had laying around... the gear that was
in it when I put the turbo on it was SCARY noisy
with clunks and what not(it was the worst sounding
gear I ever heard that was still rolling)
can't believe goint to a 2.94 or 3.23 would hurt anything... did he switch to a glide???
Its a 727... I dont think the 3.23 would hurt either
but the lesser gears do load the turbo harder which
is what makes the boost
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Re: Time to turn up the boost... what will it run.
[Re: MR_P_BODY]
#1441028
05/26/13 02:24 PM
05/26/13 02:24 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
Quote:
Quote:
good running I was goning to say if all goes well you should pick up 4-5 tenths. I wonder if you went up on the gear if that would help? You have 2.76's correct? maybe try 2.94's or 3.23's Does anybody make a 3.08 for an 8.75???
The shallow gear loads the turbo harder than a steeper
gear BUT he is giving up low end acceleration.. there
is a happy balance with the gears... I know he put
in what he had laying around... the gear that was
in it when I put the turbo on it was SCARY noisy
with clunks and what not(it was the worst sounding
gear I ever heard that was still rolling)
can't believe goint to a 2.94 or 3.23 would hurt anything... did he switch to a glide???
Its a 727... I dont think the 3.23 would hurt either
but the lesser gears do load the turbo harder which
is what makes the boost
I'd think the 3.23 would build boost at lauch, we aren't talking about a 2600lb car here. I do know my next build will be a twin whisle car... for sure.
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Re: Time to turn up the boost... what will it run.
[Re: challengermike]
#1441034
05/27/13 09:39 AM
05/27/13 09:39 AM
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Joined: Jan 2005
Posts: 3,635
Oakland, MI
dizuster
OP
master
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OP
master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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This thing has lots of issues really. It's got it's tongue hanging out at 6k, and it's beyond done pulling. So more gear would mean more finish line rpm. Crosses the stripe at 5500 already, so there really isn't much room in the room range to fix that. However the converter is slipping 25%, so if I could fix that the rpm might come down. It's possible that the gear would help the slip too, but I don't know that for sure.
Also, I can build more boost on the starting line, that's not an issue. But the 255/60 drag radials won't take any more. So again another reason why more gear would seem to be going the wrong way.
Hard to say. I am 100% certain that the combo could be better, but I'm not sure if I want to spend any more money on the 8 3/4" (how hard can you really leave in a 3700lbs car and a Trans brake!), or if I want to put more cam in it for done more rpm (with the stock rods!)
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Re: Time to turn up the boost... what will it run.
[Re: dizuster]
#1441035
05/27/13 09:56 AM
05/27/13 09:56 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
This thing has lots of issues really. It's got it's tongue hanging out at 6k, and it's beyond done pulling.
4-cylinder stuff so take it for what its worth..
1) The Reliant would go quicker and quicker the more the final drive ratio was lowered, started out with a 3.50 ratio and final change was all the way down to 2.60. Car would come out of the hole with 27 pounds of boost and inside a second or two be at 35 psi.
I'd shift at 5500 and the engine would be done at 6000. 2.5 was a torque monster making over 500 ft/lbs
2) Optimum air fuel ratio of the car was around 12:1 under boost and go through the traps at 1650-1700 EGT with probes about an inch out from the number two and four exhaust port.
Turbos LOVE load, my advice is to change the rear end gearing. The top fuel guys found this out years ago but NHRA froze the final drive gearing because the speeds were getting too high on the top end.
Notice the car has no problem launching and is pretty much in third gear right away (10.41 at 132 mph)-
http://www.ebay.com/sch/sam_rambo/m.html...=p2047675.l2562
If I remember right, this is with a 24.5" M&H slick down at Cecil County.
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