<VV> Re: Turbo Boost

[Bill Elliott]

You have two main problems to deal with...  detonation and pistons.

You can control detonation beyond 15psi with your setup (by using water 
injection and some sort of knock sensor/ignition).  An MSD will work, 
but a more finely tuned device for a Corvair turbo is the Safeguard from 
Ray Sedman( american-pi.com ). This gives you a knock sensor, boost 
retard, and rev limiter all in one device and can be specifically tuned 
to your specs.

However, 15psi is the point at which the TRW pistons collapse. You can 
go to around 20psi with the KB HK pistons, but these are very brittle 
and VERY prone to detonation damage, so you have to be VERY careful when 
using them. Best way to go (with a little more room for error) are the 
custom forged pistons from Ray.

(If you're going to run a high output Corvair turbo, you need to talk to 
Ray...)

I like Warren LeVeque's water injection... and his progressive mod to 
the Weber for better throttle response.

The third problem (which you will likely not see on the street) is heat 
buildup. I think most of the guys running turbos on the track limit 
boost to less than 10psi.

Bill


>
> Bucketboss at aol.com wrote:
>
>> I have a LM Turbo 180 that I will be running this spring and I have 
>> a  question for the bent parts and melted pieces guys out there.  
>> This engine has 140 heads cut to 8.5:1 , TB 20 cam, dual springs, 
>> balanced,  2206 TRW's, Weber 40mm carb, and a wastegate. It has yet 
>> to be  fired. My question is this. What WG  spring should I limit my 
>> fun to?  6-8-10 psi or can I go higher and to what limit without 
>> SERIOUSLY limiting  durability? I plan H20 injection. Has anybody 
>> tried to use a MSD  ignition with the boost controller for better 
>> control?  
>> Thanks, I would appreciate any insight.
>>  
>> Dave Fierek
>
>


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.15/223 - Release Date: 1/6/2006