Standard cams with Tomei type B vale springs and retainers

[Shiven]

Hey guys

Recently my intake valve springs let go on cylinder 3, so I'm looking at options to replace them. I was thinking of the Type B valve springs from Tomei as I want to add cams later on when my budget allows. So my question is has anyone run type B springs with standard cams? The product description doesn't have any prerequisites for the springs, but I just want to get your guys opinions.

[amnash]

Just buy cams.. Tell your wife it's a safety thing lol

[caliber676]

You'll probably wear the cams out quicker. But honestly just spend the extra 6-700 bucks and get the cams lol

[Shiven]

Haha if I could buy the cams I would. I've pulled the head and want to get the car running again and changing cams doesn't require removing the head, so the cams will have to wait. So will the added spring pressure just put extra wear on the cam lobes?

[caliber676]

Yupp^ it might be minimal and prolonged, might be quicker.

[hp44incgtr]

Just buy cams.. Tell your wife it's a safety thing lol..


haha lol funny guy i tell the wife that all the time work like an chum..

[Shiven]

I was also wondering how much more lag the cams will add, cos my car already boosts quite late with the GT2540's

[link_26]

Cams will not add more lag, in my opinion build it back to stock and save to do cams, springs, retainers and valves all at once.
Do the job once do it right.

[Daryl @ RightDrive]

Cams will not create more lag, they will help reduce lag. For example, the Tomei Type B cams are designed to improve response and reduce lag with mid to large size turbos. You probably won't see a straight power gain from the cams, but with a tune, you will see improved spool up and better response.
I have the Tomei Type B cams and they helped a lot with the 2530 turbos I have.
And the cams are only $580 which is pretty reasonable compared to other brands.
Also with these cams you do not have to change anything else, try are drop in.

[Skym]

With cams it makes engine inhale more air at lower rpm and you run engine richer via ECU to match. The exhaust gas created from running engine richer at lower rpm helps to spool the turbo's quicker (gives better boost response or basically turbo's reach peak boost earlier in rpm).

Usually 260 duration Poncams create a cross bow look to dyno graph at lower rpm (slightly less hp than stock cams at lower rpm, probably won't notice it when driving car), but mid to high rpm hp, torque is increased. How the cam timing is set on cams plays a role in whether you get more bottomend, less topend or more topend, less bottomend or more throughout powerband.

The valve seat pressure with Tomei valve springs is said to be less than factory until you shim them (they say in catalogue that you have to buy the optional shims), which brings them up to factory figures for valve seat pressure. It shouldn't wear any different to stock valve springs if has same seat pressure, but support higher lift, rpm.

There are more aggressive lift, duration aftermarket cams with more aggressive valve springs (seat pressure) to suit that might wear valve seats quicker (race only setup, might last's 3500km under hard use).

It's said Procams give you more down low, throughout powerband (hp, torque), but require Tomei lifters, shims, valve springs, etc.

[Shiven]

The reason I don't want to build it back to stock is because I'll have to buy a new set of OEM springs, which seems like a waste. The GT2540's are terrible with respect to response, but I cant find a buyer for them so unfortunately I'm stuck with them. My car makes peak power at around 8000rpm, so I want to rev the car to 8500rpm (I've already got a Nismo oil pump and ATI balancer) to get a slightly wider power band.
So I figured now that the valve springs let go I'll upgrade them so I can rev that 500rpm higher, but type A springs have a 8500rpm limit so I thought type B would give me some head room.

Thanks Daryl and Skym for the info on cams, I'm used to normally aspirated cars where longer duration means less midrange and more top end. I see Tomei says the Type R cams give better response than the Type A and B, has anyone tried them?

Here is a pic of my dyno graph so you can see what I mean, car only hits full boost at 6000rpm