Figured out my bogging problem

mgbv8 · Post by **mgbv8** » Fri Jul 20, 2007 9:45 pm

I'm sticking too much gas into the engine on the launch. The revs are not high enough to cope with the gas. I'm fitting an rpm window switch to solve the problem.

Post by **Coops** » Fri Jul 20, 2007 9:52 pm

why not back the gas off a bit at the start?

mgbv8 · Post by **mgbv8** » Fri Jul 20, 2007 10:13 pm

I tried that Tony. But she doesnt launch hard enough.
I'm going to have a bash at the Sunday of USC to see if I can launch hard off gas, and bring it on big at 4000 rpm. She will handle a 75 shot off the line, but the 150 shot just bogs my old V8 down until the revs are above 4k.

Post by **Coops** » Fri Jul 20, 2007 10:15 pm

you using a controller?

mgbv8 · Post by **mgbv8** » Fri Jul 20, 2007 10:27 pm

Yep
But only a Mini max.

Cant afford as max Ex!!!

Post by **Coops** » Fri Jul 20, 2007 10:31 pm

try and get hold of a second hand maximiser mate,
i use one, i want a max ex but i too cant afford one

Paul B · Post by **Paul B** » Sat Jul 21, 2007 2:30 pm

mgbv8 wrote:I tried that Tony. But she doesnt launch hard enough.

There's no replacement for displacement.

mgbv8 · Post by **mgbv8** » Sat Jul 21, 2007 11:43 pm

Agreed Paul
But my trusty 3500 has done so well for a 32 year old engine. And she has more to give too.
The old 215CI will make a 12 dead soon mate. Just need to get the launch and 60ft sorted. It is a whole new ball park with the auto, and I'm loving every minute of the learning curve. Especially with pistons only costing 13 quid each!!

Lewis · Post by **Lewis** » Sun Jul 22, 2007 9:11 am

Especially with pistons only costing 13 quid

Haha , that's awesome

I think a controller here would see you in great shape, being able to ramp it up and get more down, without it bogging. Take a bit of the shock out of it as well.

Maybe an alternative would be a two-stage system? Not sure of the logistics on that one though.

Paul B · Post by **Paul B** » Sun Jul 22, 2007 5:49 pm

mgbv8 wrote:Agreed Paul
But my trusty 3500 has done so well for a 32 year old engine. And she has more to give too.
The old 215CI will make a 12 dead soon mate. Just need to get the launch and 60ft sorted. It is a whole new ball park with the auto, and I'm loving every minute of the learning curve. Especially with pistons only costing 13 quid each!!

How about a smaller torque convertor, so it'll spin up quicker? Con the gas into thinking you have a bigger motor

mgbv8 · Post by **mgbv8** » Sun Jul 22, 2007 7:10 pm

I'm already using a holeshot 2800 converter. She locks up around 3000rpm.
Maybe if I fitted a 4000rpm stall converter I could do what you say Paul. Maybe I'll stick one in the new race car. I still like to have some road driveability on the MGB, and the 3000rpm stall speed just hangs on to a reasonable MPG.

mgbv8 · Post by **mgbv8** » Sun Jul 22, 2007 7:12 pm

I forgot to add!

That makes sense Paul. My cam doesnt really get on top via the rhoades lifters until 3700 rpm. Then she will take shed loads of gas.

Food for thought, thanks.

Perry