1800 zvh FRST 195 chip, beiges, 8/9psi boost, piper cam and pulley (possibly)

it wont rev past about 5k.. now i think my rev counter is right...

you know when youre in say a standardish car and youre accelerating for maximum speed in 5th... and the revs just won't climb anymore... well thats what im getting in virtually all gears. (cant control in 1st at that revs to check and 2nd is bit dodgy)

it just wont build over that....
no rev limiter or hard cuts seeming to cut in... just seems to virtually stop??

any ideas?

cam timing maybe? or is something fundamentally fooked somewhere? (its very strong from 2.5k to 4.5k!! loads rev range! lol)

 

FPMSL

 

standard t3 turbo?

 

lol

 

when does it stop revving?

 

about 6:30pm on a wednesday?! nah about 5k!!

yeah seems to be standard T3 turbo.

PS - rick don't laugh it aint funny!!

 

We missing something on this post.

 

no mate... its a genuine problem I have with the car!

but.... it may well be a flaw thats inherent with the engine I have!

 

lol!

soft boost hose colapsing? maybe not mapped for 5K+?? god knows.....

 

I would say the hose from the filter or metering unit to the turbo is inploding but then again who am i

 

ah its probably not mapped for fook all.

but just surprised it still wont do it.

dont think its a boost hose collapsing but maybe intercooler is whank in terms of flow and pressure drop?

 

needs a shorter stroke

 

oh ya bastid!!! do one!!

its gotta stay till ive had some moneys worth out of it... or I blow it up.

 

Not to breatch 5k rpm it dont

 

sooooooooooo any ideas???

as my current 1800 16v zetec feels quicker top end!!

 

Check for restrictions, fit a suitable turbo, have it set-up.

Has it been set-up before, if so by who?

 

only had the car on the road since tuesday!! drove it a max of 80 miles.

car was bought like that... so nope not setup.

im a little dubious about taking it to be set-up without first having a go at checking the basics.. as its Ł100. and if its engine, turbo or IC problems... or even cam problem then they will be replaced with totally different solutions... hence making the set-up redundant.

hopefully ill get change to check cam timing soon see what thats at.
I would of thought the standard t3 would of still allowed 6k.
also check if it is actually a t2 cam thats in there.

are the timing marks diff on a ZVH? maybe someone has just thrown it together? without DTiing it?

 

What could be wrong with the I/C?

 

its a big merc one... big inlets and things but plastic end caps on it so its obviously not the be all and end all of solutions.

I doubt its causing too much of a pressure drop as it doesnt look THAT bad and its pretty big but was just a concern

 

Timing will be as usual CVH i would have thought. PM Jon erst a link to this post, im sure he will be a great help as i belive he encountered and solved this on his (with NMS cam and a t34).

 

bttt for jon or anyone else who wants to make a sugestion

 

jon didnt solve it witha cam and turbo, it was solved when he found out the head had been assembled incorrectly

 

any idea what on the head?

 

Is it EFi oe MFi?

Matt

 

One of the valves wasn't seating. Do a bore leakage test (If only three tuners had done that first )

It came to light after changing to double valve springs. When changing that cylinder obviously you pump air into the chamber to hold the valves up. It was obvious then that air was coming out!!

Definetly the first place to check. Does it rev past it if you do it off boost i.e rev to 4900rpm come off throttle and take it past off boost? Mine wouldn't go above whatver I did.

 

iirc it was valves not seating properly or something...

dont quote me on that tho... ask jon or do a search

ps guess who built the head

 

Clint did. Not BSW and it was just the one valve. exhaust I think...

 

where's that 007 smiley when you need it

 

mine revs ok lol!- well did last night comming ome from luton

 

its what u gett for buildin a lego engine Melv & cheaping out on a 16v head!

 

lewis - I aint built it!! bought in this state! lol

valve not seating sounds very likely if thats a symptom you get!! as its breathing a bit.

ill have to comp test it asap.

Matt its EFI.
(oh can you email me wrt to postage prices on 8 litres cheers as im undecided! lol)

 

rich.... was yours just limited to 5k by the driver??

 

was ok at 6.4k in 5th last night chap lol!
as for the 5k limit- yep!
although now i think the map sensor is fooked - the car is like skippy the busy kangeroo when you boot it flat out

 

jon.... what was actually the problem exactly with the head though?

was it in the build of it or was it a seat problem?? (i.e. components put on wrong or missed etc or not lapped or what?)

cheers in advance!!

 

not sure, just got it recut and lapped in. Probably a guide put in slightly off IMO.

 

Rich - i have a spare 2bar off a Saph if its any use to you? i think your running OFAB arent you - so you can use them.

 

What effect did the cam/turbo have then

 

288bhp

They were upgraded before my revving problem. The revving problem only came up when it was to be mapped as I never revved it that high running in.

 

Nice result

 

right......... started it up today after gapping the plugs fixing a burst water hose and sorting the breather system out....

NOW............ fookin hell does it smoke!! so its fooked somewhere!!

I connected the bailey breather so two rocker cover pipes went into it... one from sump and one to atmosphere....

this wasnt good enough and the car REALLY smoked like fook on tickover.

with one rocker cover pipe going to atmosphere and two of the bailey pipes going to atmosphere there was no smoke from the tailpipe...

does this help diagnose the problem anymore? is it the rings being that worn or could be something else?

also it wont rev past say 5300 even with no load.... just revving it... i havent held it at that as it has no load, but 5300 is pretty much all it will physically rev to?