TiZiK

How much you think forks actually bend? Serious question. I use old fork tubes as breaker bars and they are tough as nails. I'm running a Holset HY35 on a slabby and also had to remove the crossbrace and shave down the other mount on the left side for proper clearence. I have a good 1.5inches between the turbo and tire but this fork flex claim is always looming in the back of my head so I'm really curious about how much flex there actually is?

I have APE 85mm Gorilla block. Wasn't aware they made an 86mm. Liners got to be getting pretty thin I would think at 86mm.

I contemplated this option as well. The one on the left side would be ideal for turbo feed if pressure/flow is adequate and has no affect on main gallery pressure.

Modified HY35. I just installed the 7cm turbine housing. Cold side is original. SPECIFICATION- -Large alloy Holset compressor housing with 4inch ported anti-surge inlet and 2.25in v-band outlet -500bhp capable 76mm 7 blade compressor wheel with 52mm inducer capable of 3bar boost -Oil cooled journal bearing core with 360deg thrust bearing and heavy duty shaft -Quick spool 7cm (~0.55 A/R) turbine housing with T28 inlet flange and 2.5inch v-band outlet flange -12 blade high flow 65mm turbine wheel with 58mm exducer

Oh trust me, was not easy. And my first set left a lot to be desired but they worked and were solid. It’s really our only options. Pay someone, or tackle ourselves and learn a few things along the way. I found just jumping into it was the best way. If you try to sit and think it all out you’ll never start and will just be overwhelmed with the task at hand.

Holsets are sooooo underrated. Maybe cause they were never mentioned in Fast and Furious. Lol

My compressor side is pretty big and it really only fits in one spot. That’s why the cross member had to go. This is gonna be a drag bike only tho so I’m not worried. I’m also using a front end off an 01 R6. It has a much larger offset helping to gain a bit more clearance up front. I was weary of spending money for off the shelf headers so just made my own. Tedious, but worth it. I just tacked it up and brought it to a welder for final welding. Guaranteed to fit this way. I know the UK has a few places to just bring your bike but no such place here in canada. Not for these old school bikes anyhow.

Ya, if you’re doing a slabby, it’s tight up front. The switch in housings has me re-doing my headers. 9cm was t3 and 7cm is t2. I had to cut the cross brace off the front of the frame

Journel. But don’t be fooled. Holsets have some of the best wheel designs. They’re also one of, if not THE, largest turbo manufacturer in the world. read the link I posted above to Stavs site

I was gonna say that with all the advancements in tuning, and the accessibility of it all, tuning properly would be the best way for heat management internally.

Top picture is the 7cm housing. Bottom picture is the 9cm. 7cm housing retains original turbine wheel and is a straight swap.

Decided to stay with the Holset. Managed to get my hands on a rare(ish) 7cm turbine housing. Should lower spool and keep me in the turbos efficiently zone over a wider rpm spread. Guys with 1.6L report seeing positive pressure by 2500rpm and full boost (20psi +) by 3300. Should work well with the 1316.

Good to know. So no risk of the seat moving? I guess having my welder do a small pass to close them up wouldn’t hurt? it’s a good chunk of change the guy is asking but it really is needed with my build. 85mm block and stock valves would be the limiting factor I’d think. appreciate the input

Need some feedback from the hive. Looking to buy a cylinder head that’s outfitted with oversized valves and bronze seats with some porting. One cylinder has some cracks around the sparkplug hole. Is this easily repairable? One crack is pretty much right to the seat. Will the seat have to be removed to weld it? What would be involved with a repair like this? I really want this head for my turbo slabby but am hesitant due to the cracks.

I get what you're saying but that is probably mostly due to Garrett being such a mainstream brand name. Holsets are mostly regarded as heavy commercial turbos and although the heavy part is correct, their wheel technology is up there with, if not better than, Garrett. They've produced turbos for Indy cars even, but I'm not trying to discuss which is the better brand. They're both really good at the end of the day. I was just wondering if anyone has used either and what their results were. Granted, the Holset in question is a larger turbo than the disco potato. The 9cm^ turbine housing on the Holset is close to a .65 A/R and I think the Garrett is a .48 A/R. The Holset compressor side is also massive in comparison moving appx 500 cfm. I started this thread as I may have the opportunity to grab a new GT2860RS but the specs I have read has it maxing out at the bottom end of my target HP with the Holset. Just looking for some real world feedback when mounted to an oil boiler. If anyone cares for a bit of reading on the Holsets, Stav out of the Uk is a big fan of them and has done a superb write up. Compressor Racing, also out of the UK, sells them as well. They currently have HYs with a 7cm^ housing for £500 and is an absolute beast of a turbo. Super fast spool and 450+HP capability. http://www.stavtech.co.uk/home/the-ultimate-holset-turbo-guide-probably