5 GT Turbo EFI - GT Turbo

[Andyquadra]

anyone used a gtx2860r gen 2 ? How much quicker is the spool up on these compared to the gt2860r ?

I think the spool is very similar, but the top end is higher?

 

[Mark Davis]

anyone used a gtx2860r gen 2 ? How much quicker is the spool up on these compared to the gt2860r ?

I know of someone who ran gt2860r and was hitting full boost of 30psi at 5500 but hitting around 15 psi about 5000. From what I've read GTX should spool a little sooner. I'll know for sure in about 4 weeks.

 

[DaveL485]

The x variant is normally the same spool with a higher top end hp capability. The GT2860RS on Amrits car will do 360hp, the guy I bought it from upgraded to a GTX2860 and that was 420hp, with no reduction in response.

 

[Mark Davis]

So crank is back from regrind by the sounds of it. Just waiting for Mark to source bearings and then build engine. Hoping to have everything back together in Feb.

@la21t still has injectors for sale so just waiting on a price for those. Barring a trip to Forge for new actuator rod I should be good to go.

Decided to buy original Bosch coil pack and need a new set of leads too as one of mine has a split by the looks of it.

Also bought new oil feed with tee piece for oil pressure gauge. Waiting on AEM oil temp gauge which is due next week.

 

[Gary]

View attachment 18360 Turbo arrived today, I went with a gtx2860r gen 2. Looks sexy, let's hope it performs well.

Can I as where you bought the turbo from?
Thanks

 

[Mark Davis]

BTN Performance, was about £1200.

 

[Mark Davis]

@Gary 856800-5003S - Turbo Assembly Kit T25 / 5 bolt 0.64 A/R

 

[Gary]

Proper Job that!
I was looking at the GT2554r as they can provide with a T3 flange, but I've also had prices from Simpson exhaust to custom make a new manifold and system, so I could have any flange put on it. Still not 100% on which turbo to go for

 

[vassilisa]

Hi Mark, we 've talked on fb concerning those squish areas.

For sure not I'm not an expert, still struggling to make this EFI conversion work as it should, but would be glad if I could contribute to anything as I have already gone through some of your issues I guess..

Consider Magnecor KV85 Competition 8.5mm leads, great stuff with nice options and support (custom lengths and 45° angle for the spark plugs plugs)

Also make sure there is an appropriate oil restrictor to the oil inlet feed of your new turbo; bearing turbos don't like too much pressure: Does my turbo require an oil restrictor | Turbobygarrett

Just a note: totally eliminating those squish areas on your head will enlarge your combustion chambers heavily thus the new compression ratio will be far less than what you had before; a totally different engine?

Also, what's wrong with tubular manifolds???
I 've fitted one and have a sense of 'maybe it does not perform like it should'!??

 

[Mark Davis]

Hi Mark, we 've talked on fb concerning those squish areas.

For sure not I'm not an expert, still struggling to make this EFI conversion work as it should, but would be glad if I could contribute to anything as I have already gone through some of your issues I guess..

Consider Magnecor KV85 Competition 8.5mm leads, great stuff with nice options and support (custom lengths and 45° angle for the spark plugs plugs)

Also make sure there is an appropriate oil restrictor to the oil inlet feed of your new turbo; bearing turbos don't like too much pressure: Does my turbo require an oil restrictor | Turbobygarrett

Just a note: totally eliminating those squish areas on your head will enlarge your combustion chambers heavily thus the new compression ratio will be far less than what you had before; a totally different engine?

Also, what's wrong with tubular manifolds???
I 've fitted one and have a sense of 'maybe it does not perform like it should'!??

Hi Vassilisa,

I probably won't remove squish pads this time round but I did consider a low comp set up with low comp forged pistons but decided against that too. I wanted to stay with standard internals for this build as not pushing past 250hp and felt it was a bit overkill for my needs.

I did use a tubular manifold when on carb but from what I understand after speaking to other members, is it has never been proven that tubular manifolds have a huge affect on C1J, many people making good power with standard cast manifold. I'd love to see back to back tests between the two though.

Thanks for the tips regarding turbo restrictor, it's definitely something I plan to look into although I didn't run one on my last turbo and all was fine, I seem to remember the GT cores have restrictor built in, I'd have to check to be sure.

I'll look into those leads, hopefully they connect onto my coil pack as my current ones have a nice satisfying clunk when they connect.

 

[vassilisa]

Hi Vassilisa,

I probably won't remove squish pads this time round but I did consider a low comp set up with low comp forged pistons but decided against that too. I wanted to stay with standard internals for this build as not pushing past 250hp and felt it was a bit overkill for my needs.

I did use a tubular manifold when on carb but from what I understand after speaking to other members, is it has never been proven that tubular manifolds have a huge affect on C1J, many people making good power with standard cast manifold. I'd love to see back to back tests between the two though.

Thanks for the tips regarding turbo restrictor, it's definitely something I plan to look into although I didn't run one on my last turbo and all was fine, I seem to remember the GT cores have restrictor built in, I'd have to check to be sure.

I'll look into those leads, hopefully they connect onto my coil pack as my current ones have a nice satisfying clunk when they connect.

If I understood correctly you will be using the repaired head from CTM, which has the squish pads heavily transformed, or not?
Generally speaking, EFI conversion (due to better fuel atomization, control blah blah) would allow 'higher' comp ratio leading to better engine efficiency?

I use GT2560R and have this as a restrictor (see pic)

Magnecor leads are tailor made if necessary; they will connect to anything you want (coil pack etc) and provide more than this satifying 'click' when they connect!

 

[Andyquadra]

Thanks for the tips regarding turbo restrictor, it's definitely something I plan to look into although I didn't run one on my last turbo and all was fine, I seem to remember the GT cores have restrictor built in, I'd have to check to be sure.

Hi Mark
Roller bearing turbos REALLY don't like high oil pressure, anything over 1 bar and you'll need to be looking at a restrictor

Andy

 

[DaveL485]

I seem to remember the GT cores have restrictor built in,

The don't but they should come with one, it's obviously there when you look as theyre made of brass and they are a male-male connection.

 

[Mark Davis]

With any luck engine will be back together this weekend. Plan is to then get engine back in the following weekend.

Popped over to Forge this week for new actuator rod, only £20 for them to supply and fit.

 

[Mark Davis]

Engine coming together nicely thanks to Mark. Just a few more little things to sort including modifying dizzy as obviously no longer needed and welding bung to sump for oil temp.

Ordered a new Mocal oil cooler yesterday with stat and rubber hoses this time as they look a little more supple than braided.

 

[Adey]

coming together nicely. is it going back for mapping again once fitted?

 

[Mark Davis]

Yes @Adey - cam change, VXR injectors and new turbo. Will run it in and iron out any little issues before booking in with Scoff again.

 

[Adey]

nice work, should be really nice with a fresh build

 

[Mark Davis]

Hope so, can tidy exterior up then too.

 

[Mark Davis]

Bye bye dizzy