ditched the twins, went super phat!

[RonA]

Sounds like you are on the right track now. You are supposed to start with a 62. Upgrade to a 64. Then go to a 66. Then a silver bullet. Then go to twins so you can tow and daily drive. Turbo shops have to be able to pay bills and buy groceries just like we do. :-laf



Ron

 

[RobertP]

all of you guys that are ditching your SPS62/4/6's... How easily can they bolt up to a 3rd gen if they aren't a already for a 3rd gen? and how much? PM me. .

very good question please shoot me that price also. my money tree has just about dried up.



Robert

 

[Forrest Nearing]

Sounds like you are on the right track now. You are supposed to start with a 62. Upgrade to a 64. Then go to a 66. Then a silver bullet. Then go to twins so you can tow and daily drive. Turbo shops have to be able to pay bills and buy groceries just like we do. :-laf



Ron

lol, on this truck I started w/ twins, had an sps66 in my hands, decided it might be too much, went sps62, now needing more turbine and more compressor :-laf

 

[RonA]

Interesting about your g springs. I've had a couple of sluggish pumps. One was an expensive wizzbang from JR that was a dog. Another was a new 887 that I sent out to get increased to 420cc. When I got it back it was anything but impressive. I made a fixture that I can bolt my plate and afc to. It puts them in the same relationship they are in when on the pump. The 887 that was taken to 420cc was comical. When I put the regulated air into the afc I could see that with the AFC and plate full forward, the afc arm would hold the lever 3/16" away from the plate. I modified the afc so that the arm would clear the plate and it was a whole 'nother ball game. I don't see how pump shops can miss this kind of stuff.

 

[Forrest Nearing]

Ron, it was flat out wierd... I've messed w/ the AFC on this pump a lot since I got it... found a lot of fuel actually from how the shop set it up for the original owner. Granted, he wasn't looking for all out performance, just a solid, EGT concern-free 400ish RWHP towing setup. I think he took it to them and said "here, make this pump do 3000rpm", and I THINK they did it w/ a different baby spring... I swapped the baby spring that was in it for one out of a PDR 4k kit and it governed out at 2500



wierd... at one point I pulled the shim off the small springs and left everything else the same, and it'd pull to 3000, but it was gutless!



while I feel pretty comfortable with the AFC and how it limits fueling, I clearly know NOTHING about how the p7100 governor works. but somehow the setup that was in it, while allowing the truck to rev to 3k, was limiting fueling somehow... but to a lesser degree as when I pulled the shims.



oh well, I'd rather feel like I had a little too much fuel than too little :-laf

 

[Signal73]

williams im thinkin silent C

 

[JasonCzerak]

Jason,

This is an off topic question: How do you pronounce your last name? My thinking is "Chairack"

You are absolutely correct. If you're going authentic polish, yes, that is exactly how you pronounce it.



Otherwise the "c" is silent.

 

[Jim Fulmer]

When I put the regulated air into the afc I could see that with the AFC and plate full forward, the afc arm would hold the lever 3/16" away from the plate. I modified the afc so that the arm would clear the plate and it was a whole 'nother ball game.

Bingo! That is the best tool I own, helps you talk to the pump.



Jim

 

[nascar mark]

When I bought my new to me 98 12v I thought I'd try running a single as I've been running twins for years on my 93, so on went a 64/14 with ported exhaust housing and drilled out flapper orfices on my 98 for the past month now. 1650* and climbing with stock 215's, custom plate and mild custom DV's at 43 psi. Spool up is ok but it won't come close to cleaning up my fuel and the egt's aren't cutting it. I'm pulling it off soon and a set of our towing twins for faster spool up and less egt's are the only way in my eyes to make me happy. I don't know how some people will put up with that hot of egt's. Each to their own.

 

[RonA]

From what I have read you will only drop 100 degrees on your egt's by taking off the single. Fortunately you will loose another 100 for each turbo in the twins setup. 300 seems to be about right. Happy New Year to you and the BC gang.



Ron

 

[Jim Fulmer]

I curtainly didn't gain any 300 degrees dropping the B/B off my setup! I would have freaked out as that would put me close to 2K on EGT's. I gained around 125 degrees dropping back to a single, and stopped working on the the turbo setup..... stays tight, doesn't leak, fits all the time and doesn't break.



Jim

 

[Forrest Nearing]

I curtainly didn't gain any 300 degrees dropping the B/B off my setup! I would have freaked out as that would put me close to 2K on EGT's. I gained around 125 degrees dropping back to a single, and stopped working on the the turbo setup..... stays tight, doesn't leak, fits all the time and doesn't break.



Jim

when I got the single bolted up, I just stood there and stared for a minute... I was tempted to crawl in there and take a nap there was so much room!

 

[crawler]

Forrest after the ordeal you had been through all weekend you would have cuddled up to a cactus if it meant you were going to get a little sleep.





~Wes~

 

[Jim Fulmer]

It seems there is going to be a new truck on the block for next year. I local guy is building a 52 chevy(I believe) except he's doing it on a tube frame. Randy my cyl head guy is going to build the motor much like mine as well as the head. He talked about running Twins as he has rode in my truck but it may be short on room, so I elected to say run a Silver Bullet and a 2 stage N2O setup. There going to run an auto with it and would like to be faster than the 10's and you can guess who he wants to tune it



Jim

 

[nascar mark]

Hey Ron,



Thanks and all the best to you in the new year.







Jim,

You can't be talking apples to apples on fuel only. You must be talking about running Nos for those figures. What is your egt's at 600hp on #2 fuel only foot to the floor in OD for say, 10 sec's?



If twins are built right, you will see a 350deg drop in egt's over the single on #2 fuel only with nothing else changed. Unless you run such a big single ( again #2 only) and then you might as well have a boat anchore out the back.

 

[Forrest]

Probably safe to say the head was worth a honest 200* Sounds like you almost have it figured out Forrest

Wow ... 200* ...



That & a cam ...



Mark, I wish you'd had a ported head when we found out mine was cracked.

 

[mattymac]

Hey Ron,



Thanks and all the best to you in the new year.







Jim,

You can't be talking apples to apples on fuel only. You must be talking about running Nos for those figures. What is your egt's at 600hp on #2 fuel only foot to the floor in OD for say, 10 sec's?



If twins are built right, you will see a 350deg drop in egt's over the single on #2 fuel only with nothing else changed. Unless you run such a big single ( again #2 only) and then you might as well have a boat anchore out the back.

I agree, I just drove RonA's truck and there is no comparison from his twins to my SPS66! I mean absolutely no comparison!!!!!! at around the 500 HP mark for me I am 1300 plus on a wide open run in 6th, the hottest I could get rons truck was about 1000 and his pulled like a freight train compared to my truck!



Maybe these larger singles just like a better flowing motor, but you would think the twins would like it just as much? CFM cools egt's and theres no doubt that twins in the right configuration can flow alot more than a single.

 

[Jim Fulmer]

Jim,

You can't be talking apples to apples on fuel only. You must be talking about running Nos for those figures. What is your egt's at 600hp on #2 fuel only foot to the floor in OD for say, 10 sec's?

10 seconds, holy cow that would be about rotate speed..... no kidding, 130+ starting out at say 50. Not that I've timed it but that is my thought.



The most I've seen at level out on #2 only is about 1725 at 42 or so psi, call it 1550 with the water on at 45 psi. No it leans out with the bottle on because it not enough gas... . only a . 063 solenoid... . I've seen EGT's at 1900 running 62 psi and it was flat flying... best short pass the truck has ever made, even had my hands shaking. Don't know how it will act now as it has allot more supply fuel.



Jim

 

[RonA]

Jim. You need to contact Los Alamos, They want their mobile fusion experiment back.

 

[bmoeller]

all of you guys that are ditching your SPS62/4/6's... How easily can they bolt up to a 3rd gen if they aren't a already for a 3rd gen? and how much? PM me. .

It can be done ( Just did that, only going the other way. 3rd gen turbo changed to 2nd gen. ). Just save yourself the headaches, and get the correct turbo in the first place. Fought me the whole way.