turbo time....

I'm partial to the draw thru system for tuning reasons but done some day dreaming about using the HR42 plumbed to a manifold and pressurized. I like the turbo out front but thats better fitted to injection and too many things going on to take on a new learning curve.

Les

Having the turbo out front like Dave's is the best for efficiency. Mine is an old ATP kit with a few adaptations (like the HSR 42).

Yes I'm still running the HSR 42. We've not run the bike on a dyno, but a customer of ours has a 1075cc turbo setup similar to mine - and at 18 lbs of boost hit 150 HP on the dyno in humid and hot Florida.

I have a pressure switch that activates the ignition retard. Fairly simple to do. Here's a youtube video of it when we were debugging the setup.



One of the winter projects was the Air/Fuel sensor. From this we went up on the needle jet to richen the midrange - and also moved the accelerator pump to start coming in at 1/4 throttle to help as well.

lushbaugh wrote: right now i have an 1105 kit with like 10.1 so ill need new pistons then.

Get an early 80 j-series cylinder head and drop it on there,it will put you right where you want to be compression wise.

Street Fighter LTD wrote: Here is 2 pics of a street turbo setup I really like.
Note short exhaust to front mounted Turbo and long hivolume tubing to intake ports.

very nice wireman i have one at my fingertips so i just need the adapter kit. i think i got it for like 100 bucks complete

This bike made 297 rear wheel hp back in 92, 1045 with 30# boost and the nitrous was not working. AMA horse power shootout at Daytona bike week.


This bike made 192 at the wheel, same year.




There was another Z1R turbo that made 170's but kept blowing the tire off on the dyno.
All of these are factory Z1R turbos! The big tire pink one ended up in West Virginia doing 1/8 mile dirt drags.

Les

jeff im still drooling lol

thats a shame its dirt dragged les. im amazed they are pushing that. i just want 170ish with a dash of reliability lol

When you get the head dont wont worry about stainless valves and titanium stuff,get a good valve job done on it and buy good springs for it.
If you going to work on the ports i say spend time on the exhust side,thats where a turbo motor makes its money spinning the turbo.
The intake is force fed and will take care of itself.
Keep the stock camshafts that come with the head.
pay attention to the details just like assembling any other motor,welded crank/crank cap brace good studs .
No reason to use shim under buckets or any of that stuff
A properly built 1015-1075 turbo motor should have no problem handing a decently built streetable 1197 motor with carbs its ass,same thing for most sportbikes in a straight line blast if you can handle it.

that black turbo is over the top bad

les holt wrote: This bike made 297 rear wheel hp back in 92, 1045 with 30# boost and the nitrous was not working. AMA horse power shootout at Daytona bike week.

Attachment Larrys_pink_turbo_92.jpg not found

This bike made 192 at the wheel, same year.

Attachment Rays_Z1R__92.jpg not found

There was another Z1R turbo that made 170's but kept blowing the tire off on the dyno.
All of these are factory Z1R turbos! The big tire pink one ended up in West Virginia doing 1/8 mile dirt drags.

Les

this is awesome. favorite thread ever. and wireman that great thats the info i needed. can i rough port it myself and smoothe the exhaust side or farm it out to a pro?