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| 3800 SC Exhaust System - Headers anyone?... I need another 20-40 HP!! (Page 2/4) |
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DimeMachine
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JAN 19, 08:37 PM
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| quote | Originally posted by La fiera:
He is already using E85 and that would give him plenty of cooling. What I would do if I had that set up to take advange of the cooling properties of E85,
I would install a 7th injector right after the TB. By spraying E85 in the upstrem it can absorb some heat from the incoming air before it gets compressed.
At the same time the cooler compressed air has the oxygen molecules packed closer together making the charge denser and even more so that it also
carries the extra oxygen and hydrocarbons from the E85 itself. It'll be like water/meth but with a punch.
But then again, he has to balance the extra intake volume with more exhaust flow. |
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My biggest concern here would be about E85 getting into the supercharger bearings and dissolving the grease resulting in failure. It has been a while since I had a SC apart so I might be wrong but I don't think I am...
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OntarioKev
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JAN 19, 11:03 PM
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The intercooler will help. Most of your power from the intercooler comes from pullying down though. You could add an intercooler, and a gen V and stay on the 2.8, and you MIGHT get 20hp, but again that sounds like a lot of money for 20hp to me....
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Dennis LaGrua
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JAN 20, 05:04 AM
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My series III I runs 11 lbs of boost with a 3.4" pulley. The engine runs strong but would not run without KR's until I added the SSIC (for deck clearance). That allowed the engine to make the extra power safely. As for headers they should help but I am unconvinced that they will give you more than what a removal of the main restriction will. The main restriction point in the exhaust is the front manifold and the Powerlog eliminates that. Didn't use the GTP headers because you lose a good part of the trunk. IMO, the powerlog may be as effective as the headers will be. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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La fiera
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JAN 20, 07:53 AM
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| quote | Originally posted by DimeMachine:
My biggest concern here would be about E85 getting into the supercharger bearings and dissolving the grease resulting in failure. It has been a while since I had a SC apart so I might be wrong but I don't think I am... |
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This would fix that problem. I've been using this since switched to E85
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DimeMachine
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JAN 20, 09:11 AM
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| quote | Originally posted by La fiera:
This would fix that problem. I've been using this since switched to E85
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Interesting. I will have to ponder the 7th injector idea... Not sure how you would manage the AFR as the stock PCM would have no way of managing it.... My initial reaction is it would be easier to just use a nitrous kit as that way you get more oxygen and the cooling affect. I have 2 big concerns about N20. 1. where to get it around the twin cities. Seems like quite a drive. 2. Expensive and short lived. Seems like the way most go though when they run out of M90 ability and dont want to go to a turbo...[This message has been edited by DimeMachine (edited 01-20-2020).]
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Dennis LaGrua
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JAN 20, 10:42 AM
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| quote | Originally posted by DimeMachine:
Interesting. I will have to ponder the 7th injector idea... Not sure how you would manage the AFR as the stock PCM would have no way of managing it.... My initial reaction is it would be easier to just use a nitrous kit as that way you get more oxygen and the cooling affect. I have 2 big concerns about N20. 1. where to get it around the twin cities. Seems like quite a drive. 2. Expensive and short lived. Seems like the way most go though when they run out of M90 ability and dont want to go to a turbo...
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The M90 is not designed for a wet intake charge. If the engine needs more fuel you can upsize injectors and adjust the MAF table accordingly.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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darbysan
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JAN 20, 10:49 AM
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Just a thought, but would changing the final drive gear ratios in the trans (Chain Gears) up to 3.69 from the stock 2.93 help in the quarter mile time. I know when I switched rear ratios in one of my other cars, it felt like I had added a new engine with 100 more HP. I know it would be quicker off the line, but not sure how the top end might work out for you. This was one of the mods I had planned on my SC3800 before I sold it. ------------------
'87 GT , '00 3800 Series II SC, 4t65e, Vue Power Steering. (SOLD)
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DimeMachine
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JAN 20, 10:55 AM
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| quote | Originally posted by Dennis LaGrua:
The M90 is not designed for a wet intake charge. If the engine needs more fuel you can upsize injectors and adjust the MAF table accordingly.
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Don't need any more fuel, The point he was making was since I am on E85, what if one was to inject some of the E85 prior to the blower to help cool the intake charge. My biggest concern was fuel management and blower bearings haveing their grease dissolved. Easier/better to go to Nitrous before doing this.
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DimeMachine
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JAN 20, 10:58 AM
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| quote | Originally posted by darbysan:
Just a thought, but would changing the final drive gear ratios in the trans (Chain Gears) up to 3.69 from the stock 2.93 help in the quarter mile time. I know when I switched rear ratios in one of my other cars, it felt like I had added a new engine with 100 more HP. I know it would be quicker off the line, but not sure how the top end might work out for you. This was one of the mods I had planned on my SC3800 before I sold it.
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This is a good thought as there is plenty of time spent in third gear in the high 4500 - 4800RPM range and going to lower gears would allow the engine to operate in the low 5000 RPM range during that 3-4 seconds to make more power. I wonder about durability of the tranny and traction with the M.T. ET street tires with lower gears.
Anyone have any first hand b4 and after at the track with 3800 and a gear change? [This message has been edited by DimeMachine (edited 01-20-2020).]
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sourmash
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JAN 20, 11:07 AM
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I probably just missed it but is your engine the series II? If so was the supercharger ported?
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