How To Select The Correct Turbocharger/Torque Converter?

[Scoobum]

We don't have E85 here either.    I'm stuck with 94.  I was thinking of tuning the car to 20psi with alky which should make it a decent performer.

20? You meant 24. Obviously a typo.

[Forzfed]

I can see that, Steve!  I only used the stocker for the initial breakin, just in case something goes bad I didn't want to take out the CPT-66.

Brad I was thinking maybe 22psi but that would be the most for street use.

[Steve Wood]

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[reality]

All this talk about 10 sec cars and the reality is


 https://www.youtube.com/watch?v=uAIsDJK2P6

[phil_long]

I enjoy reading and learning from you guys. It's always a treat to consume such useful information. The only issue I have is grouping everyone into the same category who buy parts that you say they "don't need" and referring to them as "cool guy" parts. I've read Steve's site through and through, which is why I have a good idea on what's going on with my car and what to address. I literally regret not going straight to 60lb injectors, and not because I've maxxed out my 42.5's, but for a piece of mind when I get ready to turn the boost up. I actually feel like Julio's alky kit is a cool guy part for MOST out here who removed their old working alky kits to buy his. His kit is definitely superior to any other kit for sure, but how many actually take full advantage of how good it really is? His kit provides the comfort of "room to grow" which is the main reason people run it and the ONLY point that I'm attempting to make about doing things only once.

[Steve Wood]

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[Forzfed]

I thought Mohawk had some good gas what happened to that?

Didn't see your post, yes it is decent by far the best pump gas here.  It probably has a bit more than 10% ethanol in it at times.  And because of that you need a bit bigger injectors, that is why I will be running 80's now.

[phil_long]

Lol @ Steve

[Scoobum]

Food for thot. Grumpy cracked the 9's with 60's and alky. I ran out of injector with race gas and 60's at 6.7 at 105.

[reality]

OK I thot about it. Just because your scan tool  says idc is at 100% doesn't necessarily mean it;s the injectors fault


And the 100% is a calculated number.

[Forzfed]

OK I thot about it. Just because your scan tool  says idc is at 100% doesn't necessarily mean it;s the injectors fault


And the 100% is a calculated number.

Absolutely!  If the pump isn't putting out the volume bigger injectors aren't going to help.  That is why cranking up the pressure helps, more going into the injectors and less back to the tank.  One of the guys in the club had a 190 lph pump and when I tuned it for him I ended up cranking the pressure to 60 psi.  There was 7 turbo buick at the track and a couple people commented on how that is too much pressure.  Someone turned it down and his mph went from 112mph to 108mph, which equates to 40 rwhp on that car.

[Scoobum]

Curiously enuf, my IDC with 80's is lower than at 7 flat than it was the 60's at 7 flat. Discuss amongst yourselves.

[reality]

Your [/size]ET / MPH[/size] computed from your vehicle weight of 3500 pounds and HP of 720 is [/size]9.87[/size]seconds and MPH of [/size]136.96[/size] MPH.

[motorhead]

Most don't run near enuf valve spring pressure. 130 lb valve springs on this flat tappet cam. Discuss amongst yourselves.

I've used these when planning and building my boosted LS engines:

http://www.wallaceracing.com/boost-spring-pressure-calc.php

http://www.wallaceracing.com/calc-valve-spring.php

http://www.wallaceracing.com/dynamic-cr.php

[Scoobum]

We had a look at the lifters when I overboosted this engine. Lifters were spinning nicely with no wear. Best thing to do after proper break in procedure is to take it straight to the track and beat on it like a seal pup. I'm fairly certain the faster the engine spins...the faster the lifter spins. I was using the 981's...but they softened up pretty quick. We were swapping them out 2-3 times a season. Read a post from Dusty from when he raced 109's. He was swapping valve springs several times a season. Most don't realize they soften up pretty quick. The car will start getting slower on the back half. Swap the springs in...and the MPH comes back up. You can actually 'see' it on the RPM gauge panel on PL with regards to the RPM struggling in high gear.