240 HP + Mods = ? HP...
Thread Starter
Pro
Joined: Aug 2002
Posts: 614
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From: Edmond OK
240 HP + Mods = ? HP...
OK experienced guys....
I have a 240 hp convertible and have done the following:
Gutted out MAF + Throttle body bypass + Dynoflow mufflers + removed Frisbee + Cut airbox and K&N + 160 and hypertech stage II chip + Underdrive pulley set + throttle body 1" spacer + Air foil.
What kind of horsepower should I be getting? If you believe all the hype around these mods, I should be up to 300, but I would feel lucky to have added 25hp. :confused:
I have a 240 hp convertible and have done the following:
Gutted out MAF + Throttle body bypass + Dynoflow mufflers + removed Frisbee + Cut airbox and K&N + 160 and hypertech stage II chip + Underdrive pulley set + throttle body 1" spacer + Air foil.
What kind of horsepower should I be getting? If you believe all the hype around these mods, I should be up to 300, but I would feel lucky to have added 25hp. :confused:
Team Owner
Joined: Sep 2001
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From: Athens AL
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Re: 240 HP + Mods = ? HP... (BioRxOkc@aol.com)
Throttle body spacer and airfoil along with the hypertech are all worthless, they dont give you anything.
My guess would be around 270-280 crank HP.
My guess would be around 270-280 crank HP.
Melting Slicks
Joined: Mar 1999
Posts: 2,535
Likes: 2
From: Rochester NY
Re: 240 HP + Mods = ? HP... (vader86)
Maybe you gain 10hp all that stuff you mentioned, its may not gain any at all. The only seat of the pants is you need header, exhaust and cam combined. Since your car only has about 40k miles on it. If I were you, I would do a head&cam package, header and free flow exhaust. Reprogram your computer. Everything else no need to change, let it a lone. You should have a pretty strong running car. Most of the tuners are specialize in LT1/4 and LS1. But They are few tuners out there also specialize L98 motor. Here one of them is http://www.moreperformanceinc.com. Give them a call they can hook you up a package for your needs.
Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads
Pic can be seen here http://hometown.aol.com/brucevette/m...age/index.html
Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads
Pic can be seen here http://hometown.aol.com/brucevette/m...age/index.html
Race Director
Joined: May 2001
Posts: 14,165
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Re: 240 HP + Mods = ? HP... (BioRxOkc@aol.com)
Don't believe all the hype. Gutting the MAF seems to do a little, a 160 thermo will make it run cooler. All the rest are useless. The largest restriction the the L98 is the intake and the cam. Doing heads at the same time only makes sense, and then you need headers to take full advantage of all of that. It costs more but you will make more power.
If you just want to make the car go faster with minimal investment get some gears :)
Oh, I didn't see underdrive pulley, that will gain a little.
[Modified by Nathan Plemons, 1:10 PM 8/17/2002]
If you just want to make the car go faster with minimal investment get some gears :)
Oh, I didn't see underdrive pulley, that will gain a little.
[Modified by Nathan Plemons, 1:10 PM 8/17/2002]
Racer
Joined: Oct 2001
Posts: 274
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From: Bradenton Fl
Re: 240 HP + Mods = ? HP... (Nathan Plemons)
I have all the mods listed in my sig. I put some of my 1/4 mile results in a hp. calculator and it said I was making between 300-310 at the crank and 230-240 to the wheels, but the calculator is just a guess I'm sure I'm no where near those numbers
Safety Car
Joined: Jun 2000
Posts: 4,870
Likes: 25
From: Long Island, NY
Re: 240 HP + Mods = ? HP... (tntcorvette)
i'll guess you gained ~15 hp....biggest bottle neck on the l98 is the stock TPI....
Exhaust is the biggest bottleneck IMHO.
Vic
Team Owner
Joined: Dec 2000
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From: SE NY
Cruise-In II Veteran
Re: 240 HP + Mods = ? HP... (BioRxOkc@aol.com)
The frisbee is worth 10hp, the 160 deg stat (when coolant temp is there) is worth 10hp, cut lid + K&N is worth 10hp, mufflers & cat maybe another 5-10hp; so I would guess around 35-40hp gain.
You may have gained more but take it to the local strip and get some time slips, get it weighed at launch setup and use the HP equations on my site to get crank hp.
Get a mandrel-bent 2 1/2" front Y and hi-flow cat- back and check out my hp gains from similar mods.
Cut back your spark plug ground electrodes for another 8-10hp gain.
You may have gained more but take it to the local strip and get some time slips, get it weighed at launch setup and use the HP equations on my site to get crank hp.
Get a mandrel-bent 2 1/2" front Y and hi-flow cat- back and check out my hp gains from similar mods.
Cut back your spark plug ground electrodes for another 8-10hp gain.
Melting Slicks
Joined: Oct 2000
Posts: 2,019
Likes: 2
From: Na
Re: 240 HP + Mods = ? HP... (65Z01)
Last year I had exactly all the mods you have listed down to the dynoflow mufflers and lets say my nitrous plate is a TB spacer. I ran a 13.79@101mph. That should give you an idea of where your at. You have to take into consideration that I have a couple which I believe is lighter and also have a higher gear ratio.
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Melting Slicks
Joined: Mar 1999
Posts: 2,535
Likes: 2
From: Rochester NY
Re: 240 HP + Mods = ? HP... (NUckINg FuTS)
The frisbee is worth 10hp, the 160 deg stat (when coolant temp is there) is worth 10hp, cut lid + K&N is worth 10hp, mufflers & cat maybe another 5-10hp; so I would guess around 35-40hp gain.
Wow if its work this way. Then I probably have over 1500hp on my set up. Remember all those stuffs have to work together. You can't seperate them 10hp here and 10hp there. Sorry, it does'nt work that way. The only possibly gain 35-40hp is changing the cam. Other than that you will never see 35-40hp gain realisticly.
Bruce
93LT1 Conv w/Zf6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads
Wow if its work this way. Then I probably have over 1500hp on my set up. Remember all those stuffs have to work together. You can't seperate them 10hp here and 10hp there. Sorry, it does'nt work that way. The only possibly gain 35-40hp is changing the cam. Other than that you will never see 35-40hp gain realisticly.
Bruce
93LT1 Conv w/Zf6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: 240 HP + Mods = ? HP... (Bruce)
Actually those mods can add up to substantial gains. Though I agree that some mods depend on others in a chain.
For example adding a hi-flow cat may not show much gain if the rest of the exhaust is restrictive, similarly with some intake mods.
I've added 55-60hp and haven't done cam, heads or headers yet. The gains have been due to the sum total of many "little" mods.
But of course I have increased fuel pressure to correspond to increased air flow.
For example adding a hi-flow cat may not show much gain if the rest of the exhaust is restrictive, similarly with some intake mods.
I've added 55-60hp and haven't done cam, heads or headers yet. The gains have been due to the sum total of many "little" mods.
But of course I have increased fuel pressure to correspond to increased air flow.
Le Mans Master
Joined: Feb 1999
Posts: 6,631
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From: Stoplight City IN
S. Indiana Events Coordinator
Cruise-In I Veteran
On my '89 L98 I have true duals, open air box, K&N, that stupid air foil thingy :rolleyes: (the previous owner put it on there, not me!!!), AFPR and 160 stat.
At 149,000 miles my dyno numbers were 228 RWHP and 325 RWTQ. Factor in the 18% driveline loss, and I should be around 269 net HP.
With your mods, I'm guessing your numbers will be similar to mine.
At 149,000 miles my dyno numbers were 228 RWHP and 325 RWTQ. Factor in the 18% driveline loss, and I should be around 269 net HP.
With your mods, I'm guessing your numbers will be similar to mine.
