building boost with a manual

[tippmann243]

not sure if this is the right forum

ive got a few questions about building a turbo 4.3 that has a manual trans. i know that most of you sy/ty guys brake torque it to build boost off the line, but since im gonna be running a manual i cant do this. im also worried about a low compression motor to be slow outa the hole untill i get boost.

are there any ways to build boost on a manual vehcile when launching

also since im going to be running a manual would i benefit more from a stock compression lower boost motor? granted it wont make as much power as a low compression higher boost motor, but it should suite my needs good

thanks for any input
-mark

 

[syclonekid43]

Re: building boost with a manual

line lock it

 

[cloneman315]

Re: building boost with a manual

a 2 step on the igntion works very well on a auto

 

[Jer]

Re: building boost with a manual

'Stutter box' on the ECU works well too if anyone mod's that particular ECU. You can also just bounce from WOT to off throttle between 500rpms +/- the ideal launch point. Just bring the revs up to just before the desired launch point and then go WOT and off quickly back and forth to build boost. That's what I used to do in my AWD Eclipse and it takes some practice to get down to build the right amount of boost, launch at the right RPM and do all that at the exact right time. Of course this is the poor man's boost builder and there are other ways to do it that aren't as frugal but much easier.

 

[Jer]

Re: building boost with a manual

a 2 step on the igntion works very well on a auto

Did you mean manual?

 

[2kwik4u]

Re: building boost with a manual

I was thinking of a "stutter" box as well....something similar to what the DSM guys use in thier manul cars to build boost at the line.

 

[Jer]

Re: building boost with a manual

I was thinking of a "stutter" box as well....something similar to what the DSM guys use in thier manul cars to build boost at the line.

Haha... I just realized how I spelled that:

'Studder box'

Man, I need to get out more.

 

[2kwik4u]

Re: building boost with a manual

ROFL....I'm not sure which way is correct

 

[tippmann243]

Re: building boost with a manual

thanks for the help guys, this project is WAY down the road, but its nice to gather some info a head of time

 

[cloneman315]

Re: building boost with a manual

yeah stutter box 2 step same thing,mine works awesome

 

[Robert Lone]

Re: building boost with a manual

Or you could bolt a blower on it for instant boost at WOT! :tup:

It works on mine...

(sorry, that was my failed attempt at a good sales pitch)

 

[myclone]

Re: building boost with a manual

Retarding the timing for launch will do it or you can use a small shot of N20 right before launch. A two step (aka stutter box) would prolly be the easiest and least aggravation of them all though.

 

[Jer]

Re: building boost with a manual

I would prefer not have the parasitic loss at high RPM that the super charger adds in addition to the turbo. But, that's just me and a small NOS shot on a pressure switch that shuts off when the system reaches a certain pressure level is easier, more cost effective and doesn't add weight over the front wheels.

 

[Robert Lone]

Re: building boost with a manual

easier, more cost effective and doesn't add weight over the front wheels.

The extra weight is the only thing keping the front end on the ground when I launch my truck...LOL

 

[Jer]

Re: building boost with a manual

The extra weight is the only thing keping the front end on the ground when I launch my truck...LOL

What are your ET's and trap speeds?

 

[Robert Lone]

Re: building boost with a manual

I've never run the truck, but David's 1 successful pass with the 6-sp was 11.21 sec I believe...

That was @ 23psi and nitrous super-cooling the KB A2A intercooler just before the launch.

Every other time he tried to make a pass w/ the manual tranny he had to call a tow-truck...

One of the parts on my "Wall of Destruction" is a clutch disk outta the truck...

Here's the rusult of one of those passes. Where's the splines? :rotf: