What would you all recommend as far as modifications for more low end torque and shifting the power curve down in the RPM range? As I have a permanent grin on my face every time I get in the car let alone when I get thrown back in the seat!

01 MN6 32k miles

I have been reading up on cams and many of the larger cams seem to increase power in higher ranges of RPM but I am looking to reverse that...is that something plausible in a heads/cam swap or would I be better off changing rear gear ratio?

01 MN6 32k miles

All opinions are welcome and appreciated!

 

supercharger!!

 

Correct (in part), but specifically a roots type will produce the low end torque, as opposed to a centri.

 

Turbos

 

So FI seems to be the solution...I would probably have to change internals for the FI correct or run low boost?

By internals I mean, springs, rods, cam, possibly crank? clutch? or what all would I need to do...if I recall correctly, in the last issue of Vette Magazine, a guy had an LS1 powered stingray and he still had stock internals but was running something like 8 lbs of boost? Does anyone know anything about this or any place i can be referred for more reading on this?

Thanks for all of your time and responses!

 

Probably cheaper to go 4.10 gears.

 

small cams do wonders. 218/224

i run a 224/224 cam and have quite a bit of low end grunt.

 

It all depends on the money you have to accomplish this goal, my thoughts are if you want to be on the cheap end, put in a 3.90 or 4.10, however if you want to spend more, I agree with Lucky, go with a maggie blower and call it a day, you will have more than you know what to do with, plus they sound wicked, you can go the H/C route also, but I am not crazy about opening up the motor if you do not have too. Just my .02!

 

I believe the magnacharger kits are compatible with a completely stock engine. Just have to get a new hood to clear it. Without more cubic inches you won't be able to come close to a positive displacement blower for added low end torque with any other internal engine mod.

 

For what it's worth, if your car is stock, a supercharger will answer all your questions, I recomend calling ECS and talking to Mike or Chris, they will be able to answer all your questions and I think you will be suprised, you will have tons of power to play with and you will be happy to drive a rocketship, and the best is you can leave your car stock, headers would be a great mod to add but not needed. I just ordered a kit from them and they are great to deal with!

 

Great thanks for the advice! Do you know if they sell any 'roots' style supercharger?


Also does anyone have any good companies that they would recommend I purchase 4:10 gears from?

Thanks for the advice!

 

A kenne bell supercharger would be better than the maggie but more money. Get what you pay for. And I think they fit with stock hood

 

uuuuuh no they do not fit a stock hood the KB hood is even bigger than the maggie hood. the KB is about the same cost more or less when you consider the entire kit + hood

a KB. Whipple or a maggie will get the low end power that you want, 4:10 gears will give the feel of more low end also.



500rwtq at 2k rpms == lots of wheel spin and traction control cannot keep up so be careful.

 

Where can I find some twin turbo kits? I have heard from people that TT kits run quite a bit more than a SC kit would...anyone know of any reliable companies that offer TT kits?

Thanks,
Fitt's Vette

 

Thanks for your opinion! No opinions are ruled out in my book, Im just looking for some general knowledge and doing some shopping!

Do you by chance know of a company that sells 3.90's or 4.10's? Thanks for the input!

 

I have been reading some things in the FI section and a lot of arguments that I seem to be noticing about the roots style supercharger is that they basically rule the low range but fall flat as you reach mid range...am I understanding this correctly or is blowing some smoke?

Thanks for your time and input!

 

The centri's build boost with RPM and so the power climbs accordingly. The pos displacement have nearly 100% boost just off idle so they produce lots of low end power but are less efficient at high RPM so they generally won't produce as high a peak HP number. It's all about what you want the car to do, and where most of your driving is done. If you want to brag about how much peak hp your car makes a centri is probably the better choice.

 

where in the attached dyno graph do you see the power fall flat? if you want to see something fall flat just look at the high or low rpm power of anything other than the pd type of blower they all have much larger changes in power output often refered to as peaky power graphs. the concept is that you need to look at usable tq (tq is what moves the car not hp) and even if the tq is not increasing it is still at a level that the car will be accelerating rapidly.

sorry must have missed the original question I thought it was "Low End Power Help" if you are looking for peak hp numbers, top end power or setting up a 1/4 mile car then that is a diffrent question. in general the following generalizations can be made about the operating ranges of the diffrentforms of FI
1. pd blowers (roots or twin screw) rule the roost at low end tq and tend to have a very flat tq curve.
2. centris build boost with rpms and tend to have great top end hp but nearly stock tq/hp below 2500 rpm.
3. turbos depending on size and design of the system (true of all the above also) tend to have a swell of tq that rises quickly and falls off on the higher rpms (again depending on design and sizing so no flames).

it is not a question of one being better than the other but more of what you want out of the car. for me It is more fun to have 500 rwtq at 2k rpm on the street and I find it hard to use the upper rpm power that a centri would make. if you look at the rwtq curve that my car makes you will see that the TQ does not really fall off so much as it never takes off and climbs thru the roof like a turbo or centri does but in fact has more than 450 rwtq at 6k rpms this gives me the advantage of not having to worry about what rpm range im in as there is no weak spot in the tq curve just lots of tq everywhere. if I was going to the drag strip a lot the centri would work better and the turbos would fit in there someplace.

as to the roots type not being as efficent on the top end there is some truth to that but the real question is how much of your time will you be pushing it at high rpms (the answer depends on how you intend to use the car and only you can decide that)