Turbo questions

[Dnyce]

Ok, first post, building a gen 1 dragbike stock
engine, wossners, spacer plate, probably stock cams, ported head.

No intercooler. And no radiator either. Hahn turbo, want to say it’s a super 16 modified with external wastegate and not the super 20 but it’s not in front of me.

Arp studs top and bottom, billet clutch hub and billet inner hub. So nothing should blow up lol going to run vp98, ft550 I have a few questions for all u smart ppl

rings-top ring .020, second ring .016?

Cams - 108/108?

Log style plenum Like the Hahn or the bigger more triangular shaped plenum like the proboost? I already have a Hahn plenum,
have the capabilities to build the other style as well.

Should I vband the connections or the usual clamps and rubber connectors are sufficient for 20-25lbs of boost?

throttle bodies-stock? Or ported?

Ive read a lot on here and youtube, so I feel fairly confident but a few turbo specific things I’m curious on what the latest and greatest minds think.

I don’t have a specific hp number in mind, but 7.60’s on a easy tune is what I’m looking for. There’s a 7.70 index class I want to get in on.

 

[ItsDooomz]

Okay, you have my attention, where is this 7.70 index class? I wanna play too

Those ring gaps maybe a little tight. If that were my engine I'd start at 18 top ring, 24 second ring, minimum 15 for the oil ring. I wouldn't even mess with spacer plate or adjustable cam sprockets if you're running stock cams, Id just drop them in and send it.

 

[Dnyce]

It’s on the west coast, western pro extreme drag bikes (I think that’s the acronym) runs it. They do a “anything goes” class and a 7.70 index. “Anything goes” is out of my budget

interesting take on the cams/spacer tho, especially in a race application. I’m not sold on stock cams, I just have some already and I haven’t seen anyone really go bigger.

 

[ItsDooomz]

You can certainly buy some big cams and a ported head, but what is it really worth? 10-15 horsepower? You could take a bone stock motor, open up the ring gap, throw in some valve springs and head studs and make 300-350 ish HP. That should put you into the 7.50's.

 

[Dnyce]

Well alright then lol time to build it

 

[Dnyce]

And what about the plenum question?

 

[202mphbusa]

Plenum for the most part will make no difference
unless it has a intercooler in it
make sure it has hold down straps

Maybe consider Meth injection

 

[busakiller]

Ok, first post, building a gen 1 dragbike stock
engine, wossners, spacer plate, probably stock cams, ported head.

No intercooler. And no radiator either. Hahn turbo, want to say it’s a super 16 modified with external wastegate and not the super 20 but it’s not in front of me.

Arp studs top and bottom, billet clutch hub and billet inner hub. So nothing should blow up lol going to run vp98, ft550 I have a few questions for all u smart ppl

rings-top ring .020, second ring .016?

Cams - 108/108?

Log style plenum Like the Hahn or the bigger more triangular shaped plenum like the proboost? I already have a Hahn plenum,
have the capabilities to build the other style as well.

Should I vband the connections or the usual clamps and rubber connectors are sufficient for 20-25lbs of boost?

throttle bodies-stock? Or ported?

Ive read a lot on here and youtube, so I feel fairly confident but a few turbo specific things I’m curious on what the latest and greatest minds think.

I don’t have a specific hp number in mind, but 7.60’s on a easy tune is what I’m looking for. There’s a 7.70 index class I want to get in on.

One thing I see missing which will be a big thing you need to make it a fast and consistent bike is a mtc gen 2 clutch. Idk how much you weigh but that might play a factor in how much hp you need. I have a turbo busa and it weighs 510 pounds and it’s a street bike. I think 475 might be attainable on a turbo busa with out going crazy. But I think you will need all of 350 whp to run 7.70 depending on how much you weigh and how well you set the bike up. To run a 7.70 you will need to run 5.0 to 4.8.

 

[Dnyce]

True, clutch wise I’m gonna be running a lock up set up basically identical to my top gas bike and if that don’t work I’ll get a gen 2, but I’m trying to use what I have as much as possible unless it really needs it.

It’ll be a bar bike, dry blocked, fuel cell, lightweight battery, so hopefully I can get it down to 345, Rider weight 180

 

[01smokes]

I'd run stock cams/head. Add springs and studs and just open the gap on the rings definitely wouldn't run the spacer and I'd go with a bigger turbo. That tiny sucker is gonna be force feeding hot air at those boost levels. Thing should fly with a bar. Good luck!