LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Quick HP mods?

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Old Jan 9, 2007 | 11:54 PM
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Default Quick HP mods?

Alright, currently i have a 94 A4 Z28 and i want to do a few quiick mods to get some power. (if possible) I have LT headers, matching Y-pipe, CAI, and a tune. Is there anything i can do at this point to pick up a few HP? I'm about to get my UD pulley back on, so thats one. Anything else you guys can think of that will actually help. Since i have a tune, i figured porting the maf would be pointless. (not that it would be great if i didn't have a tune anyway, its just a thought)

Thanks for the advice. I hope you guys can think of some stuff, because i'm stuck. I would like to get about 10Rwhp with these little mods, if possible. More would be great, but it seems irrational.
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Old Jan 10, 2007 | 12:10 AM
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Like everyone's said, on a LT1, the UD Pulley is worthless, since no water pump drive. And we all know that TBody Coolant Bypass is good for at least 5hp (7-9 the dyno sheet said).
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Old Jan 10, 2007 | 12:30 AM
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Originally Posted by Formula350
Like everyone's said, on a LT1, the UD Pulley is worthless, since no water pump drive. And we all know that TBody Coolant Bypass is good for at least 5hp (7-9 the dyno sheet said).
I disagree about the pulley. When i had it on, the car felt more responsive and a little quicker. Maybe i didn't notice the HP gain as much, but the response of the car was better and that alone is worth it to me...

I should do the TB Bypass, but im afraid something will happen and i will have a leak. That has stopped me from doing it...I don't want to screw up.

Any other mods?
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Old Jan 10, 2007 | 12:33 AM
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One Word "Nitrous"


The dealer?

Nitro Dave
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Old Jan 10, 2007 | 01:09 AM
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An Electric WP is good for about 6-10 Rwhp.
Also an exhaust cut-out.
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Old Jan 10, 2007 | 01:21 AM
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Originally Posted by TwoFast4Lv
One Word "Nitrous"


The dealer?

Nitro Dave
X2 most HP for the money. period
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Old Jan 10, 2007 | 08:17 AM
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Originally Posted by Formula350
Like everyone's said, on a LT1, the UD Pulley is worthless, since no water pump drive. And we all know that TBody Coolant Bypass is good for at least 5hp (7-9 the dyno sheet said).
I got it on mine, and it is more responsive than it was before. It puts less of a strain on everything also.
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Old Jan 10, 2007 | 08:28 AM
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Running a UD pulley also, don't know if a difference cause I installed it with the rest of my goodies.

Just do the bypass, you shouldn't have to worry about any leaks.

I've read somewhere but haven't done it myself, relocating the IAT sensor closer to the air filter instead of having it in the elbow.
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Old Jan 10, 2007 | 08:30 AM
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I've never found the underdrive pulley to be very cost effective.

You are at the point now where if you're looking for any more power gains, you're going to have to starting getting into some more hardcore stuff like a cam, converter, nitrous, etc. Personally I wouldn't waste my money on anymore things that claim "5-10hp" at the wheels, because more than likely you're going to be disappointed.

At this point if you want something cheaper and easy, a set of gears and some decent rubber would be a great way to wake the car up more.
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Old Jan 10, 2007 | 08:51 AM
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How about a bigger TB and air foil? 1.6 rockers? Being that you're A4, a stall, gears, and weight reduction would benefit you greatly, although they won't add any hp.
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Old Jan 10, 2007 | 08:57 AM
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you didn't say you had exhaust. why dont you start there. get a muffler of your liking, gut the cat. $200=20rwhp
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Old Jan 10, 2007 | 10:31 AM
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Well, i have a Y-pipe after the long tubes, then it goes into the stock I-pipe, then into a dynomax muffler.

I don't think i can get an air foil, because i have that elbow that is more clean looking and the vortech elbow isn't attached. (i forgot the name of it)

An electric water pump sounds like a good idea. How hard are those to install, where can i get them, and how do they work?

I would do nitrous, but i don't want to hurt the motor. Your right about bang for the buck, im just paranoid. I've seen to much happen.
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Old Jan 10, 2007 | 10:35 AM
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Originally Posted by Z 2 8
I should do the TB Bypass, but im afraid something will happen and i will have a leak. That has stopped me from doing it...I don't want to screw up.

Any other mods?

The TB bypass is a good mod I ran mine in front of the waterpump. You can do that if your afraid of a leak.
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Old Jan 10, 2007 | 11:30 AM
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Originally Posted by Z 2 8
Well, i have a Y-pipe after the long tubes, then it goes into the stock I-pipe, then into a dynomax muffler.

I don't think i can get an air foil, because i have that elbow that is more clean looking and the vortech elbow isn't attached. (i forgot the name of it)

An electric water pump sounds like a good idea. How hard are those to install, where can i get them, and how do they work?

I would do nitrous, but i don't want to hurt the motor. Your right about bang for the buck, im just paranoid. I've seen to much happen.
Running the factory mid-pipe after the y-pipe you're creating a restriction. Get a 2 3/4" or 3" pipe welded in there and it'll free it up.

Unless you get an airfoil used for $10 -- don't waste your time.

The electric water pump requires a little bit of mechanical experience to install, but it isn't that involved. You can find one at any of the support vendors, Summit, Jegs, etc. It operates electronically instead of using the motor to run it, so it just frees up a little power.

Nitrous systems (and the safety equipment with them) have come a long way since their horror stories a long time ago. You can run a 75 wet shot without needing to pull any timing (stock timing) and with a fuel pressure safety switch and window switch, you'll only be operating the nitrous when it is safe to run.

With the money you'll spend to get your desired 10hp -- I'm highly doubtful you'll be happy with the results.
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Old Jan 10, 2007 | 12:10 PM
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Originally Posted by WhyHelloOfficer
Running the factory mid-pipe after the y-pipe you're creating a restriction. Get a 2 3/4" or 3" pipe welded in there and it'll free it up.

Unless you get an airfoil used for $10 -- don't waste your time.

The electric water pump requires a little bit of mechanical experience to install, but it isn't that involved. You can find one at any of the support vendors, Summit, Jegs, etc. It operates electronically instead of using the motor to run it, so it just frees up a little power.

Nitrous systems (and the safety equipment with them) have come a long way since their horror stories a long time ago. You can run a 75 wet shot without needing to pull any timing (stock timing) and with a fuel pressure safety switch and window switch, you'll only be operating the nitrous when it is safe to run.

With the money you'll spend to get your desired 10hp -- I'm highly doubtful you'll be happy with the results.
You make a good point. I doubt i'll be happy after spending that much money on those mods. I already have the UD pulley, so i should just put that on. The TB bypass is something i'll think about. (since it's cheap) Instead of messing with my exhaust, i think i'm just going to go with a cutout. Wouldn't that give me the most power and be cheaper?

If i take this route, i'm going to have the muffler shop that i go to do it. Typically, with my setup where should the cut-out be? I'm going to go over there today and do it. (if i get time) But, i want to make sure it's in the right place. I know it's probably going to be pretty loud, but my car has been quiet for a while now. Besides, i figure i can always close it...

Thanks.
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Old Jan 10, 2007 | 01:39 PM
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Originally Posted by Z 2 8
You make a good point. I doubt i'll be happy after spending that much money on those mods. I already have the UD pulley, so i should just put that on. The TB bypass is something i'll think about. (since it's cheap) Instead of messing with my exhaust, i think i'm just going to go with a cutout. Wouldn't that give me the most power and be cheaper?

If i take this route, i'm going to have the muffler shop that i go to do it. Typically, with my setup where should the cut-out be? I'm going to go over there today and do it. (if i get time) But, i want to make sure it's in the right place. I know it's probably going to be pretty loud, but my car has been quiet for a while now. Besides, i figure i can always close it...

Thanks.
You can get the parts for the TB Bypass at a local auto parts store or hardware store. It'll cost you less than $5 for parts. To be honest, you will hardly feel the difference.

I'm running a 3" exhaust all the way back from the header collectors. My electronic cutout is right before the catback goes over the axle. I'll take a picture of it today when I get home from class today.

With a factory internal motor (stock heads & cam) you might lose a little bit of low end power, but you'll pick up a little on the top end. In all honestly I didn't feel much of a difference until after the cam on my car.

Like I told you earlier, because you've done the basic mods to your car, where you're at now you're going to start looking at spending a much bigger chunk of change to get some bigger numbers out of your car. It sucks, but welcome to being bitten by the mod bug
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Old Jan 10, 2007 | 02:13 PM
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I don't know how you all needed parts, I just took the piece off of the Radiator and stuck it straight into the Metal Line. I removed parts if anything..
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Old Jan 10, 2007 | 02:57 PM
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So, what do you think about the cut-out? Worth it, or no? I don't think i'll notice the down low loss. I would think making it up in HP in the long run would be better, am i right? Besides, i think with a cut-out it would sound pretty sick and would be better than what i have now...
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Old Jan 10, 2007 | 03:02 PM
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If your car isn't a DD, I would lighten it up. Back seats/seat belts and bumper supports.

But as stated by WhyHelloOfficer, you are past the good bolt ons. So it wouldn't be in your best interest to do something like a TB Bypass. I say stall it. Awesome results and it will be necessary for future mods. Or gears. Anything that will make your car faster, but not really making more HP.
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Old Jan 10, 2007 | 03:42 PM
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I took the back seats/belts out anyways, it's a DD. I won't put 4 people in my Car, that and I have alot of grocery room.
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