Do you run over 25 pounds of boost?

[Sleepr DSM]

How many DSMer's run over 25 pounds of boost? I know track cars run 30 psi+. What is your limit? What do you run on the street usually? What do you race at?

 

[jdmawd]

Depending on the turbo I think most would agree that 25-28 psi on race gas is somewhat normal. Pump can be anything from 16-23 depending on setup. I run/ran 23 psi on pump with zero knock its a pretty broad question, on stock head studs 25 is about it before you start to lift the head. with arp's you can run much more.

 

[mclaren55]

I run 23#'s on 94 octane.
Between 33-36#'s on C16.

 

[2-0turbo]

Originally posted by mclaren55
I run 23#'s on 94 octane.
Between 33-36#'s on C16.

Do you ever have any problems with head gaskets? Which one you using? O'ringed? I am planning on having my car on the road in the next 2-3 weeks with a turbo that has the capability of putting out the above described boost levels. I am on stock head bolts right now--I have ARP's on the shelf.

 

[larryd]

I ran 30lbs on the dyno on C16.. I wouldnt go over 20lbs or I should say havent been able to go over 20lbs on 93/94 octane without knocking.

 

[mclaren55]

Originally posted by 2-0turbo


Do you ever have any problems with head gaskets? Which one you using? O'ringed? I am planning on having my car on the road in the next 2-3 weeks with a turbo that has the capability of putting out the above described boost levels. I am on stock head bolts right now--I have ARP's on the shelf.

No problems with headgaskets thus far. I use a stock Mitsu 3 layer HG. Yes its O'ringed. I also have ARP head studs on the vehicle.

 

[2-0turbo]

Originally posted by mclaren55


No problems with headgaskets thus far. I use a stock Mitsu 3 layer HG. Yes its O'ringed. I also have ARP head studs on the vehicle.

I kind of thought it had to be O'ringed to hold that kind of boost. Begs teh question though: how do those diesel motors hold together with the boost they run? The most recent Cummins site I went to sells 0-50 psi boost gauges. I think I'll limit myself to 25 psi (race gas) until I do some motor work. I don't know if I'll O'ring or not. We'll see what the beast does when I get it running.

 

[marshall]

it's about time you're getting that turbo on, you've only had it for what 9 months or something? i got my T3/T4 on last weekend so much tuning to do - on my first tuning run my EGT's peaked out at 1270, of course that was only 10.5psi...putting my boost controller on today

marshall

 

[Silent2g]

i ran 28 psi on c16 in my old 95 gsx
it was amusing
lots of lag, but once it kicked in, look out.

did 18/21 on pump gas

 

[2-0turbo]

Originally posted by marshall
it's about time you're getting that turbo on, you've only had it for what 9 months or something? i got my T3/T4 on last weekend so much tuning to do - on my first tuning run my EGT's peaked out at 1270, of course that was only 10.5psi...putting my boost controller on today

marshall

Very ouch. It is getting there. I have too many projects in my life now. Believe it or not, the Talon is not costing me money every month like some of my other projects, so it doesn't get the priority.

The only big thing left for me is my intercooler setup. I am using the stock SMIC converted to air/water. I have pressure tested my stock one and it is good. I am actually trying to acquire a second SMIC and stack them for a 8X6 flow area, 8" thick core. Mucho cooling power!

Like I said, I have a ton of things cooking right now. The plan is to have it on the road by the end of February so I can get a good 4-weeks of tuning in before my March 29 VIR run.

See attached picture.

 

[2-0turbo]

Ah, one more.

 

[marshall]

looks great matt.
in your air/water ic, is air flowing through the core still or is it flowing around with water inside now? what water pump are you using?

marshall

 

[2-0turbo]

Water is going where my charge air originally flowed. My charge air now goes where ambient cooling air used to flow. I am 95% decided on using a Shurflo pump. They offer one that flows close to 5 GPM with decent head and I can buy them all day long for $70, locally. There is another Jabsco pump that Spearco recommends--I have seen some guys on the Merkur list use them too. It is a centrifugal design and would probably work well, but it is about $160. If the Sureflo works, I can buy 2 for the price of 1 Jabsco. That is my biggest unknown right now is pump reliability.

I am using two B&M tranny coolers in the stock SMIC location to cool my water (12" X 12" X 1.5" total). Reservoir is in the trunk, with tons of baffles. Total capacity is close to 5 gallons. I can use however much I need, but there is plenty of room for a lot of ice. I use a 3-way valve to block off flow to the tranny cooler when running ice water.

 

[candela]

I like the wire locks on the manny>turbine... Were you in the service?

 

[candela]

I like the wire locks on the manny>turbine... Were you in the service?

 

[2-0turbo]

Originally posted by candela
I like the wire locks on the manny>turbine... Were you in the service?

Nope, but I have probably 100 hours (as a passenger) in medium twin-turbine helicopters--my dad was a pilot for years and I got to tag along quite often. Practically every fastener is drilled and wired or secured with a cotter pin on a rotorcraft. It is actually quite visually appealing, if you ask me. They used to have a maintenance facility and I could paw around and look at all types of helicopters in various stages of assembly. It was pretty cool!

To all the guys who always complain about turbo bolts backing out, it only takes 15 minutes on the drill press and some safety wire. They will never come out--guaranteed.

 

[nine5raptor]

i participate in some SAE competitions. talk about anal about safety. all bolts must be grade 8 or higher with nylon insert nuts and safety-wired with at least 2 full threads showing.

I agree when done well, it is very sharp looking.

 

[candela]

I knew it... I used to work on ch-46 helo's and ofcourse being in the military as a helo mechanic you learn to safety wire everything =)

 

[2-0turbo]

Originally posted by candela
I knew it... I used to work on ch-46 helo's and ofcourse being in the military as a helo mechanic you learn to safety wire everything =)

It is the only way to make sure it positively doesn't come out. There are other areas on my car I have drilled the fasteners and safety wired them. You know the bearing located in the middle of the front/drivers side axle that bolts to the block? My buddies GSX has lost a bolt from there on two different occasions. Once one falls out, it doesn't take long for the other one to break and allow the axle to start flopping around in there. He still just buys new bolts and tightens the hell out of them.

Learning from his misfortune, I drilled and wired mine and have never had any problems.