dewismotorsport's C20LET Corsa gsi

[dewismotorsport]

Wow quite a wieght saving with those wings fella! any idea if you can still get them new?

I'm sure you can, the company who used to sell GRP bonnet and boots on eBay, I think they could make them, something like A & G Motorsport

[dewismotorsport]

Few niggly jobs cleaned up one was the oil filler cap was leaking so went to halfords and bought a new cap just so i could use the new rubber


Have also had a leaking sump since the new block and head went in so drained the oil and flushed it through for 10 minutes with some oil from work, then whipped the sump, windage plate and pick up pipe off and cleaned it all up, while it was off i thought i'd double check how close the pickup pipe was to the sump base, put it on my mock up engine and turns out it was way off (i didn't make it) so a quick bit of cutting and re welding and it was as it should be

Before:


After:


While it was out a blew through with the air line my oil pressure gauge feed pipe and was checking all oil related components as for some reason i have only been getting 40psi of oil pressure regardless of load or cold start, noticed this the last time i started it up so knew something was up everything seemed fine until i tried to get relief float out, it was stuck solid into the shut position I knew this was wrong as i've had the spare mock up one to bits and that glided out, finally got it out by using my scribe and hanging off it until it came out, you can clearly see the score marks on it which at the minute i have no idea why it has them or why it was stuck shut :dunno: Anyone got any ideas?????


So luckily for me i may have just found the cause before my pump failed and killed my engine (pumps done about 1500 miles tops and is a genuine GM Z20LET pump) I may be the first with this problem but i recommend everyone checks theres

Was getting late so called it a day but will clean the bore up with oiled up wet and dry and also give the float part a good smoothing and check for movement before reinstalling. Have used a small amout of sealent on the 8V gasket and sump so am letting that fully cure overnight before i top up with new oil tomorrow. Other small jobs have been to move the wideband sensor to its new location, still need to buy a new one though

[Dale]

Glad to see your sorting bits out Out of interest who did the pump pick up pipe?? As for relief valve...... wow has it scored inside too??

[dewismotorsport]

Glad to see your sorting bits out Out of interest who did the pump pick up pipe?? As for relief valve...... wow has it scored inside too??

Not a 100% sure but I'm certain the old owner did it, so it's NOT a SBS or Jav786 one, and I will further investigate the bore as it may well of, gonna ring sbd tomorrow and see if the nylon relief valve from the C20LET/XE fits I'd of thought they'd be the same size tbh

[Benn]

Where you only ever getting 40psi of pressure then?

[dewismotorsport]

Where you only ever getting 40psi of pressure then?

No used to always get about 65psi at cold start about 40psi at hot idle and about 80ish psi under load, it just suddenly wouldn't go over 40psi

[dewismotorsport]

Started putting the corsa back together today, re wrapped the top part of the down pipe as it has worn a hole through where the boost pipe crosses it so triple wrapped it in that place


Also cleaned up the relief valve with oiled up wet and dry to remove any score marks before re fitting, now glides up and down nicely. I took apart an old c20let/XE pump and checked to see if the relief valve was the same and it turns out they are so I will order a nylon one from SBD tomorrow just for piece of mind

Topped it up with the new oil and let it run up the oil pressure is back up to 65psi at cold idle and rises with load so chuffed about that i also have no leaks at all from the bottom end so that's a massive bonus

On a down side though my V clamp joints still blow which is annoying as I've tried all sorts to prevent this with no joy :cry:
Also on it's last drive when I was giving it a bit of stick it started to miss fire so assumed I lost a plug again as it went into Subaru sounding mode again so nipped halfords and bought some more RST plugs


Replaced them and the battery as that was dead and still the same :cry:

Went to Robs to use his compression tester they all came back fine, have heathy spark and fuel so must have an air leak as my revs now sit at 1200-2500 so will whip the boost pipes off to check for split silicones or joins but will order a new inlet gasket as well as tbh that's the more likely cause I'd of thought

[dewismotorsport]

New parts all ordered gonna get them all fitted up this week at work and hopefully car will be back up and running correctly

SBD nylon relief valve kit at a pull your pants down price of £70 delivered
Got two stickers with it so gotta be worth it


New wilwood ultra lite 309mm discs, inlet gasket and wideband Bosch LSU 4.9 sensor

[corsadonk]

Them discs look posh.

[CorsaTurbo2008]

looking gd m8.

[sneakycorsa]

same happend with my relief valve ony mine was the sbd valve, Now i just have my std metal valves polished to give a nice smooth surface never had any problems (YET) lol.

[dewismotorsport]

looking gd m8.

Cheers mate it's getting there!

same happend with my relief valve ony mine was the sbd valve, Now i just have my std metal valves polished to give a nice smooth surface never had any problems (YET) lol.

I believe it's cause the pump wasn't cleaned out when running in oil changes were done so tbh the nylon is just an upgrade never the less

Them discs look posh.

Yeah they do, not badly priced tbh and much lighter than the MGTF discs I was using

[dewismotorsport]

New Wideband sensor fitted and gauge now working as it should so happy days
Removed the fuel rail as I had got a random leak all of sudden and removed the inlet to find my leak, turns out the gasket was soaked in fuel and gone soft in the corner and under boost it blew a bit out :cry: Also two of the injector O rings had chewed themselfs up so replaced them as well


And the damage


Have re sealed the end of the fuel rail with fuel resistant sealer so had to leave that to dry before I start her up again

[dewismotorsport]

Fans turned up from Fenny


Gave them a good clean up and altered the wiring loom to suit and fitted up


Had to cut the headlight metal frames out as because of how my turbo sits it is further forward all cut out and fits perfect


All back together but can't drive the bloody thing as my injector O rings are pissing fuel :cry:
New ones are already on order so may look at modding the rail as there is no taper on it

[dearing5]

nice one mr dewis.

[Adam]

good stuff mr dewi..keeping the beast all sweet and respected

[steve jordan]

Nice to see it's coming along nicely and constantly improving it, looking forward to seeing this round the track next year!

[dewismotorsport]

nice one mr dewis.

Cheers mate

good stuff mr dewi..keeping the beast all sweet and respected

It's testing my patience at the minute

Nice to see it's coming along nicely and constantly improving it, looking forward to seeing this round the track next year!

Hopefully gonna get a couple in this year, but at the minute once I fix one thing something else decides to break

[the-darkhorse]

You up for kevil 22nd ????

[dewismotorsport]

You up for kevil 22nd ????

Yes mate that's still my aim

[the-darkhorse]

Fingers crossed or does that mean pull finger out .... lol .

[dewismotorsport]

Fingers crossed or does that mean pull finger out .... lol .

Both at the minute lmao

[chip]

Keevil 22nd as in this saturday coming?

[dewismotorsport]

Keevil 22nd as in this saturday coming?

Yes mate you fancy it? I still have a lot to do and little time but am determined to make it

O rings have turned up so will fit tomorrow hopefully gonna see if i can put a taper on the fuel rail as it just seems to be chewing them up every time i re fit injectors as the holes are so tight :cry:

Also ordered a pair of 350lb 7" springs as the 9" are too long for my liking and i think even the 8" would leave me no adjustment for fine tuning the ride height so my own fault really

[Dale]

looking good adam, is that the same fuel rail i'm using???