URGENT: 1521a Owners Help!

[galapogos01]

Guys,

I was going to have a go at fitting my 1521a today but realised I dont have the spec sheet for the cam!! Can anyone tell me what lift to expect at TDC so I can dial the cam in???

Jason

[EFFalcon]

According to Cam Cat (downloadable on the wade website somewhere)

36thou @ TDC on exhaust
38thou @ TDC on intake

[galapogos01]

Thanks a heap John. Dave did the same thing... i downloaded it but thought it was out of date (it says 2003!)

Now - the timing mark on the EFs.. is that for TDC or IGN (ie: 10 deg BTDC) ?

[EFFalcon]

Tdc..

[galapogos01]

thats why i thought.. but it looks too far to the right!

cheers..

[EFFalcon]

it lines up with the marks under the timing case.
www.deleted link/pics/temptiming.jpg <-- look there to see what i mean.

[galapogos01]

awesome.

got it in and it was already pretty close to spec - 32 though as opposed to 38. got it spot on with the vernier (yes, i tightened the out of the bolts).

it idles like a beast! i used the aluminium plate under the ISC trick to stop the hunting, but it still idles rough. i have it on about 1100 so it isnt close to stalling when i put it into drive.

havent driven it yet though.. bloody bracks.

[hornet]

just curious. what chip are u running?

[Walkinshaw]

Did moving the cam to spec help the idle or make it worse??

and 1100, are you sure this is advisable!!?!?

[EFFalcon]

SOunds good jason
is a high stall next on the list?

[steven95falc]

dude ive had a 1521a i did the same as what i think you have big is best but untill you get the rev limiter lifted you wont be able to use this cam and the stock diff ratio is even worse id advise you think strongly bout this and go back to the 977b or even the 1636 just trying to help

[EFFalcon]

steven95falc: he has a 3.9 LSD.

[steven95falc]

sweet cos im running the stock diff in a 95 ef manual and she was just to geared up and yea the rev limiter gave me the s cos just as it took of she started to bounce.

[Walkinshaw]

Try it with 3.23:1 + auto ;)

[galapogos01]

highstall and chiptorque are next. not sure in which order. im thinking 2500 - 2800rpm but im not sure. as most people know i have already ported the out of the head and thrown 3.9s in the rear end.

walki, dont know if it helped because i never ran the car without dialing the cam in. thought i'd go the whole hog this time, even bought myself a dial indicator.

it sounds ing awesome. ive never thought my 6 sound would like this! the hunting is completely gone with the ISC mod, well worth doing.

[EFFalcon]

get chiptorque first jason
and get a JMM 3000 highstall!

[galapogos01]

you dont think 3000 is too high? JMM are too expensive...

i need to ring chiptorque..

[Age182]

are you changin the springs too iv been looking at there 1632 i think its 198 and 206 @.50 but i lik the looks of that 1521a

[EFFalcon]

to get the most out of a big cam like a 1521a, you really need to have either a manual, or a highstalled auto, both with some decent diff gears.

[sphell]

jase, how does it go now with the new cam? From reading the forums, it seems there are mixed opinions on this cam profile. Of course it will go better with the chip but how is it at the moment?

[EFFalcon]

i think the biggest issue is that Jason can't drive his car too much.
there are a few legality problems for now

[steven95falc]

Originally Posted by EFFalcon

to get the most out of a big cam like a 1521a, you really need to have either a manual, or a highstalled auto, both with some decent diff gears.

spot on and there is seriously no point in a 1521a unles the rev limiter is lifted

[Walkinshaw]

The rev limiter isnt really the issue 5750 is plenty of revs. Saying that Stockstandard pulls his to 6300, with the shift light @ 6000.

The main reson you need a chip is to correct the MAP signal. A cam with 217deg@50 will have a serious impact on the vacuum readings within the manafold and thus due to the MAP based load tables, this will throw out the fuel and ignition timing.

[stockstandard]

Originally Posted by Walkinshaw

The rev limiter isnt really the issue 5750 is plenty of revs. Saying that Stockstandard pulls his to 6300, with the shift light @ 6000.

Your right, peak power is still below the rev limiter. My power curve peaks from 5200 to 5500. The 1521a will keep the engine revving til the rods depart the block but I doubt such high rpm helps the car go any faster. If the cam is retarded you will have probs with the limiter.

Shift light is fixed now and flashes at ~5700.

[neb]

mmm high revs... my rev limiter kicks in at 5200... not so fun, good for my engine i guess, probably doesn't really need to rev any higher than that

[steven95falc]

Originally Posted by stockstandard

Your right, peak power is still below the rev limiter. My power curve peaks from 5200 to 5500. The 1521a will keep the engine revving til the rods depart the block but I doubt such high rpm helps the car go any faster. If the cam is retarded you will have probs with the limiter.

Shift light is fixed now and flashes at ~5700.

funny you say that cos i actually went to the effort to get mine on a dyno and she was still ramping up on the curve when the limitor cut in what other mods do you guys have im just curious as from what you have said mine is pulling higher in the rev range and id doubt ive got anywhere near the list of mods that you guys do ?????

[stockstandard]

Originally Posted by steven95falc

funny you say that cos i actually went to the effort to get mine on a dyno and she was still ramping up on the curve when the limitor cut in what other mods do you guys have im just curious as from what you have said mine is pulling higher in the rev range and id doubt ive got anywhere near the list of mods that you guys do ?????

None of my mods will lower the peak power. What is the rev or speed limiter that kicked in when your car was on the dyno? Did you have a vernier gear and was the cam clocked up properly. If the cam timing is retarded, peak power is moved to higher rpm so maybe that was your problem.

[Walkinshaw]

Was it the speed or rev limiter??