How much power can a 3100 make?

[SappySE107]

Lets just go with....

/thread

[kellu]

the guy obviously isn't looking to swap his engine. I've seen an estimated 215 out of a Quad 4 GTZ http://rides.superstreetonline.com/r...rolet/beretta/

I wouldn't imagine it being hard to pull that out of a 3.1. seeing as how a stock L82 is 160hp, and an LG8 is 175hp. It isn't hard to get 25hp. Look into aftermarket fuel, intake, and exhaust systems. Bigger fuel injectors can make a huge difference. You could always bore your engine, and throw bigger everything inside. There's a number of things you could do. If I were to make a guess as to what the 3.1 can put out without forced induction my best guess would be 220hp - 240hp. Just a guess, I have no numbers to back that possibility.

[talon2swords]

QFTT
and/or they got a great deal on a 3400 top end and have a healthy 3100 bottom end.

I got lower 3400 intake manifold off of ebay for a dollar. The guy didn't set a reserve, and apparently I was the only one that bid. It's still in storage, waiting for my poor arse to use it. Plus, I'm too busy working on my wife's Hyundai that needs TLC. Yuck.

Anyhow, I was surprised to see this newer thread. Yay 3100!

[robert 1980]

If you have the money and the engine out of the car.I would throw a cam in there too.Mine is only .533 lift and really wakes the motor up a lot.

[bkaab]

Cool. I will be staring the build next spring

[95SleeperAcheiva]

80mm TB came from an Aurora motor, I adapted it to the 3.5 upper with a classified and top secret, laminated, organic pressed fiber phenolic material that I found in a NASA scrap pile. (A piece of old laminated cabinet, but my description sounds better! :P)

I then removed the throttle plate, bolted it up to the IUM and used a 1" drill mounted sanding roll and ported the IUM, adapter plate, and TB to a seamless match.

And no, it's track only.

[TGP37]

I just got done swapping a getrag 282 into my 96 GPse. Also a 3100v6 SFI.

Be sure to only use a getrag from a w-body. The same transmission, in other bodies, will have a different bolt pattern for the mounts. I found the 88-91 Grand Prix's, especially the McLaren Turbo has the parts you need. The axles won't match though, I believe a 93 (bah I forget the name) will match. I have the link somewhere.

You need the pedal assembly to mount the clutch. That requires the entire dash to come out. OR, like I did, measure-cut-weld-bolt a custom rig to bolt the clutch to the existing assembly. Used 16ga steel, worked great. But the placement must be precise or the Master Cylinder may fail its seal.
The w-body trans mount for the getrag-282 is rare now. I found 1 at rockautoparts, PontiacJeff found a performance mount for $135...then.

If price is not as important, the Getrag 284 is better...imho but the 282 is quite strong from what I hear/read.

[bob442]

I don't know how a 80mm fits let alone leaves Any street-ability

[Futures Passed]

I cut 3.5 seconds off her stock times with a 3.4 swap, 3.5 upper, 80MM TB...

Is that a custom? The 65MM throttle body was the largest I've seen that I recall. (For some reason 72MM came to mind, but even that's smaller.)

[robert 1980]

I have a nice 3400 topend for sale.Needs a good home?lol
Rockers intakes heads everything

[Superdave]

200 is easy with a 3100, Drop on some newer 3100/3400 heads (ported if possible), a well ported matching LIM and use a 3500 UIM with a 65mm TB. That will take care of the intake side. On the exhaust side swap over to the 3500 "header" type manifolds, run 2" off each side and merge it into 2.5", then a good cat and decent muffler.

That alone should net you 200 @ the crank and with a good tune you may see even more.



If you want to go further a cam will really make it sing.

[95SleeperAcheiva]

I found one of those HP calculators a few years back and was able to put in my gear ratio, weight of car, and 1/4 mile time to get an idea of the HP. I wont claim it's accurate but it has to be close. My numbers came to 305. even if it's within 20% that's 240 HP. Now I did mine on a very minimal budget, and as Smokey said, your power is in what you do to the heads, "MAKE HER BREATHE!" So, that being said, port and polish, keep her clean, and think FLOW!

I cut 3.5 seconds off her stock times with a 3.4 swap, 3.5 upper, 80MM TB, HOURS of hand port and polishing upper and lower intakes to a 1500 grit finish, open pipes, weight reduction (2660 with driver), 110 t-stat, custom torque converter from Dayco Converter at 4800 stall ($85 new), 3.5" custom cold air intake with ram air scoop under front bumper, and it put me at a best time of 14.23 in the 1/4 mile. Oh, 116 octane fuel, I don't think she needs that but race fuel smells cool man! Go to youtube and look up achieva vs camaro, and then check my other video and you can see my "hill-billy" exhaust. It works, that's what counts.

Hell, just chopping your emissions will get you 30+ HP. And don't fall for the BS and by a "High-Flow Converter." The whole concept of making an EGR system work is dependent on maintaining back-pressure. It' must have 3-5 lbs to work, stock converters do that and lowering any of that back pressure will make it fail e-check.

Good luck, 200 hp is easy. Getting it to stick to the pavement and not blow a trans apart is the hard part.

[bkaab]

Sorry thats my old car. Its the 96 I will be doing the work to. All I need to get is a different PCM and I can tune it with my DHP Powertuner.

[bob442]

The 3400 (LA1) and newer 3100's (LG8 vs your older L82) have bigger intake ports and runners and slightly bigger intake valves in the heads. The LA1/LG8 stuff is almost a direct bolt-on with a few minor alterations.

The people who stick with a 3100 are usually those without the space/equipment available to them to yank an engine out. I barely have room for my tools let alone an engine hoist.

QFTT
and/or they got a great deal on a 3400 top end and have a healthy 3100 bottom end. There is nothing wrong with saving money and building a hybrid. Nothing at all.

How ever i see a slight problem, your signature shows and states a 95 GP and a 96 GP, if your 95 is the one reciving the work you will have to upgrade or degrade your engine manigment as approx 95% of GM's built in 1995 got OBD 1.5 and it can't be tuned IIRC.

If you want to save money, and build for power, buy heads right out from wottech or send in some cores and get Ben to port them, as they come back to you assembaled, machined, and ready to go. Doing things yourself and sending the heads out to get milled ends up costing you more, unless your getting it done for free. Speaking from personal experiance.

Check the classified section often, there is a few people that were selling top ends for 150-200$

http://60degreev6.com/forum/showthre...4-3400-top-end

[Azrael]

The 3400 (LA1) and newer 3100's (LG8 vs your older L82) have bigger intake ports and runners and slightly bigger intake valves in the heads. The LA1/LG8 stuff is almost a direct bolt-on with a few minor alterations.

The people who stick with a 3100 are usually those without the space/equipment available to them to yank an engine out. I barely have room for my tools let alone an engine hoist.