how do i get more torque

[darkside motors]

Ok I got a 2 gen 420a. I did a turbo conversion to it but I'm also lookin for more torque to when coming out of the dig at the track. Any suggestions will help .

 

[phantom_19]

Only way our engines get torque is by boost. It would help if your turbo was already spooling up when launching.

 

[counti41]

morer torque can be acheived many ways, 1: by choosing a good combination of parts; cams, turbo(turbine wheel size), and downpipe( too big no torque: too small no top end power). 2:correct tuning(ecu) and cam degree will also affect torque and top end power. 3:since you are FWD wou dont really need more torque you need to work on your launch, get a good strong clutch and slip the heck out of it to get a good launch. more torque means more wheel spin in fwd you need top end power mostly. hope this helps and good luck!!!

 

[darkside motors]

Thanks well like I said before I already got my turbo in with a awesome custom 2.5" down pipe and exhaust . The turbo is a lil bigger then most others though . I put a 4088 with a 70ar housing that I got from precision and a fully built fuel system just waiting on the injectors now . As for cams there still running stock . I'm currently in the process of dropping the bottom block to send it to the machine shop for new pistons and rods . I'm going to be going 40 over and running a compression ratio of 8.8:1. Plus the head is gettin ported . Hopeing to be able to push 20psi . So with all this said what do you recommend for the clutch . I was looking at the findanza set up's .

 

[counti41]

OK sounds good, a .70 AR housing is decent but more around the middle for torque. turbo motors produce the most torque during turbo spool up the quicker it spools the more torque you will produce, but you should be ok. as for the clutch get something that can handle a lot of abuse. i would suggest a 6-puck with a sprung hub and don't get a pressure plate that is too heavy just remember that you r front wheel drive and it better to let your clutch slip than to let your transmission break. fidanza i know for the turbo dsm's use a 2300Lb pressure plate which i want to goe one of those and use a southbend clutch disk.and don't forget that boost is relative to each application tune at low boost(7-10psi) first before you crank it up to 20psi. big cams also move toh powerband and the torque to the right of the powerband so size the correctly or you will might as well be driving a HONDA. small cams=massive torque down low but not as much power up top, big cams not as much torque down low and lots of power up top.

 

[nemesis7]

Well you can do three things you can bore your block cylinders and use high compression piston, you can engine swap to a2.4 liter, or you can make a stroker motor, the higher the compression and the bigger the liter will result in more torque and horsepower.

 

[90moneypit]

Or use N2O. It has a slight torque bias over the stated hp 'rating' on a per jet basis. Basically, for a 50whp shot, you'd see around 60 ft/lbs. Just don't go wild with it or you'll have 1000 ppl on here quoting "Naws! Boom!" and other nonsense. But you will have to be extra careful using it in 1st gear though as most people blow their engines (with N2O) in first or fifth. First by lean, fifth by rich, both by detonation.

 

[tkelly27]

I think you'll be a lot happier with a smaller turbo. What you've got is a sledge hammer, and you're trying to figure out why it takes so long to drive in a nail. Ball bearings aren't magic, and that's a pretty huge turbo if your end goal is only 20psi. That turbo is said to make 700hp, which is probably in the high 30's as far as boost goes.

Your engine can't really make torque until it is on boost. You'll be happier with a smaller turbo that has lower inertia that can spool up faster. Something in the 300-500hp range will suit you better. With FWD 300-400hp with a quicker spooling turbo will be able to shred your tires on an auto-x course.

If you have a T3 manifold, a HX35 or HY35 will work well. Hahn T3 flanged MHI turbos might work too. I'm not familiar with other turbo offerings, but if you have a brand you prefer I'm sure they will have a smaller turbo.

That 2.5" down pipe likely isn't helping things either.

Just randomly found this while looking

http://www.dsmtuners.com/forums/turbo-system-tech/296935-i-dead-set-4088-until-i-read.html

In the first link you can see whatever they are dynoing doesn't make more than 250ft-lbs until 5k RPM on either turbo. A smaller turbo could be making that by 3k RPM and still give you a fun amount of boost on the top end.

 

[Shake_Zulla]

Another thing you need to think about is putting that power to the ground. You can have a million foot pounds of torque but if your wheels just spin you won't go anywhere. At this point in your build you would probably see more gains from a LSD to get both tires spinning with the same amount of power and then working on suspension upgrades to limit the weight shift to the back. LSD is a good gain no mater what your plans are for the car but suspension upgrades need more consideration in regards to keeping the car a drag vehicle or wanting to autocross it.

 

[darkside motors]

I want to thank everyone for there advice and suggestions . I would also like to keep you all up to date on the progress of the build . I have just delivered my block and head to the machine shop . The plan is for a bore out of 40 over and all forged internals plus a complete head job with new bc cams , sodium filled valves titanium spring and retainers with a port and polished

 

[counti41]

well good luck and i hope everything goes well.

 

[counti41]

whats the progress any updates

 

[gob4sho89]

Smaller exhaust does not = more torque nor does a giant exhaust = no torque. All of the thinking behind that comes from N/A applications where the pulses in the exhaust were not taken into account and improper length and/or diameter were used... These things do still play a role with turbo cars, but the pulses that are important happen in the manifold for the most part...

 

[brandonwh64]

im surprised 91stocker hasn't came in here and tried to say " another 420A post!"

 

[Slo2gen]

If you want more wtq I would HIGHLY advise you not to go with an 8.8:1 compression. Seems like the choice has already been made, but higher compression is one of the easiest ways to bump wtq other than nitrous. Like its been stated, nitrous does make more wtq than any other type of FI but also comes with an expense, if you don't have a proper set up with the right safety equipment you can ruin your engine. If you are stuck using pump gas(93) then I would go with at least stock compression if you have E85 or want to buy race gas all the time then go with something a bit higher. Like other people have also said, you have a big turbo, downsizing it would probably benefit you if you want more tq, but remember as well, higher compression motor will spool a bigger turbo faster than a low compression motor. The other route you could go would be get different cams. A properly set up cam will also help spool the turbo faster. What ever route you take good luck!

 

[darthvadar tsi]

Getting a menthenol/alchohol kit will help. Also a good tune.

 

[glowryder]

Yea.. Going 40 over isnt going to do anything for you. Like said ABOVE..lsd, Clutch 9I recomend Southbend) cams, and the 2.4 swap are big TQ yeilding things..and I agree with the hihger comp, but it would depend on what / How he is going to tune it, if hes not getting very sofisticated, then hes safer with the 8.8. Better off having a safe engine then TQ.. doesnt do much good if the engine blown ; )

 

[counti41]

well after you get the torque you so desire how do u plan on putting that to the ground

 

[BK85]

How bout a stroker kit from Howell?

Bk85

2.2 Stroker Performance Bottom end Kit - btmendkitstr

 

[Shake_Zulla]

Another thing you need to think about is putting that power to the ground. You can have a million foot pounds of torque but if your wheels just spin you won't go anywhere. At this point in your build you would probably see more gains from a LSD to get both tires spinning with the same amount of power and then working on suspension upgrades to limit the weight shift to the back. LSD is a good gain no mater what your plans are for the car but suspension upgrades need more consideration in regards to keeping the car a drag vehicle or wanting to autocross it.

well after you get the torque you so desire how do u plan on putting that to the ground

Already covered. Besides this, wide wheels and better tires you can put a splitter on, however, this wont help untill you build up a little speed. Another thing you can do is strip your car of any extra weight. For most torque you need to swap for 2.4L.

 

[cturiano]

Oh would that be with the parts you stole from me.... THEIF

 

[phunny]

Stroke her