Decent ETs for the Mods

poopstang · 01-19-2002, 12:41 PM

I have a 1990 GT with b303, 1.7s, 70mm TB, pullies, Crane Fireball ignition, full exhaust, 3.55s and Hoosier Q.T.

CAR IS LOWERED 1.5 INCHES (doesn't help)

My best so far is 13.69@100.3. I'm thinking I have about 260hp and my ETs aren't going to get much better?

Mr 5 0 · 01-19-2002, 02:00 PM

A 13.7 @ 100 isn't bad for just a B303 cam, 1.7's, pulleys, exhaust, 3.55's, and good tires. I think your guesstimate of approx. 260 HP is accurate.

The 70mm TB is a little large for your stock intake & heads. I would try a 65mm if you plan to keep them both.

Problem now is that you have a lot of air going in and out of the engine - which is good - but the stock heads can't utilize it efficiently - which is not good. With some tuning and driving practice you might knock off another tenth or so but yeah, you need to upgrade the cylinder heads/intake to see a real et drop.

poopstang · 01-19-2002, 02:05 PM

my thoughts exactly! I need heads and intake but my budget is just to tight.

Would a 65mm TB work better than 70mm?

fiveohpatrol · 01-19-2002, 02:40 PM

I don't think you would notice much of improvement at all by backing down to a 65mm (well atleast not worth the $).

If you plan on getting heads/intake in the future just stay with what you have.

You actually might pick up a little power if you go back to the stock cam too, then again maybe not.

If I were you and if your not planning on heads/intake anytime soon, then I'd try to find someone with a 65mm TB that is looking to go up to a 70mm and just trade them.

What brand is your 70mm?

poopstang · 01-19-2002, 04:38 PM

I have the polished Mac 70mm.

Is there any other relatively cheap mods i could do? chip?mass air meter?

fiveohpatrol · 01-19-2002, 07:09 PM

stay away from chips until you get your combo pretty much set and you have a custom one burned to your specs. all the off the shelf chips do is advance timing and you can do that manually.

I'd invest in a larger MAF and subframe conectors if I were you.
You could also do what I did and find a cheap Explorer intake, they're all over the place on Ebay, most of them go for around $200. I noticed a decent gain with mine, its a good N/A intake and really helped after I ported my heads.

Good luck

poopstang · 01-19-2002, 07:16 PM

Will just an intake help?
I found an explorer intake on ebay but they wanted over $300 + shipping. I could get a cobra for that.

I found a C&L 76mm MAF for $209

fiveohpatrol · 01-19-2002, 08:55 PM

yes it will help, just not a WHOLE lot. You should also try to find some used GT40 Iron heads (not the P's) or port the ones you've got.

The C&L 76mm with the aluminum intake tube looks like a great deal. I think its $209, is that the one your talking about?

by the way, what 60ft time did you get with that 13.69, thats a pretty good et for that mph, must have hooked pretty good

poopstang · 01-19-2002, 09:03 PM

Yes the C&L 76mm with the aluminum intake tube.
So you think i should get the C&L?

R/T .548
60' 1.938
1/4 13.69
MPH 100.32

exgmguy · 01-19-2002, 09:26 PM

Get the meter. It is a huge restriction. You will probably pick up another 1 to 1.5 mph with that alone. On slicks with a low 1.8 60 ft I bet you would see 13.30's or so.

poopstang · 01-20-2002, 12:49 AM

I'm gonna have some serious bottle neck'n go'n on

Nitrous Al · 01-20-2002, 09:22 AM

Don't waste the money right now, save up for the intake and heads!

01-19-2002, 12:41 PM	#1
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	Decent ETs for the Mods I have a 1990 GT with b303, 1.7s, 70mm TB, pullies, Crane Fireball ignition, full exhaust, 3.55s and Hoosier Q.T. CAR IS LOWERED 1.5 INCHES (doesn't help) My best so far is 13.69@100.3. I'm thinking I have about 260hp and my ETs aren't going to get much better?

01-19-2002, 02:00 PM	#2
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	ET observations A 13.7 @ 100 isn't bad for just a B303 cam, 1.7's, pulleys, exhaust, 3.55's, and good tires. I think your guesstimate of approx. 260 HP is accurate. The 70mm TB is a little large for your stock intake & heads. I would try a 65mm if you plan to keep them both. Problem now is that you have a lot of air going in and out of the engine - which is good - but the stock heads can't utilize it efficiently - which is not good. With some tuning and driving practice you might knock off another tenth or so but yeah, you need to upgrade the cylinder heads/intake to see a real et drop.

01-19-2002, 02:40 PM	#4
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	I don't think you would notice much of improvement at all by backing down to a 65mm (well atleast not worth the $). If you plan on getting heads/intake in the future just stay with what you have. You actually might pick up a little power if you go back to the stock cam too, then again maybe not. If I were you and if your not planning on heads/intake anytime soon, then I'd try to find someone with a 65mm TB that is looking to go up to a 70mm and just trade them. What brand is your 70mm? __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

01-19-2002, 07:09 PM	#6
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	stay away from chips until you get your combo pretty much set and you have a custom one burned to your specs. all the off the shelf chips do is advance timing and you can do that manually. I'd invest in a larger MAF and subframe conectors if I were you. You could also do what I did and find a cheap Explorer intake, they're all over the place on Ebay, most of them go for around $200. I noticed a decent gain with mine, its a good N/A intake and really helped after I ported my heads. Good luck __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

01-19-2002, 08:55 PM	#8
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	yes it will help, just not a WHOLE lot. You should also try to find some used GT40 Iron heads (not the P's) or port the ones you've got. The C&L 76mm with the aluminum intake tube looks like a great deal. I think its $209, is that the one your talking about? by the way, what 60ft time did you get with that 13.69, thats a pretty good et for that mph, must have hooked pretty good __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

01-19-2002, 02:05 PM	#3
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	my thoughts exactly! I need heads and intake but my budget is just to tight. Would a 65mm TB work better than 70mm?

01-19-2002, 04:38 PM	#5
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	I have the polished Mac 70mm. Is there any other relatively cheap mods i could do? chip?mass air meter?

01-19-2002, 07:16 PM	#7
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	Will just an intake help? I found an explorer intake on ebay but they wanted over $300 + shipping. I could get a cobra for that. I found a C&L 76mm MAF for $209

01-19-2002, 09:03 PM	#9
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	Yes the C&L 76mm with the aluminum intake tube. So you think i should get the C&L? R/T .548 60' 1.938 1/4 13.69 MPH 100.32

01-19-2002, 09:26 PM	#10
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Get the meter. It is a huge restriction. You will probably pick up another 1 to 1.5 mph with that alone. On slicks with a low 1.8 60 ft I bet you would see 13.30's or so.

01-20-2002, 12:49 AM	#11
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	I'm gonna have some serious bottle neck'n go'n on

01-20-2002, 09:22 AM	#12
Nitrous Al Registered Member Join Date: May 2000 Location: Everett, MA Posts: 417	Don't waste the money right now, save up for the intake and heads!

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