256 & 260 Tomei Cams Sr20det question

[SoCalDrifter]

Ok so its time for me to get some cams into my car im running a Gt30R with a greddy intake manifold and all the necessary bolt ons pretty much so i was thinking of going with the Tomei 260s instead of the 256s what do you guys think?

I was reading somewhere that it says you need solid lifters and upgraded valve springs for the 270s then i saw somewhere else it says you need solid lifters for the 260s also so im kinda confused maybe someone can answer that for me?? i was gunna call a shop that would know but its to late now there closed till tomarrow

also has anyone used the 260s before can you tell a big difference? im looking for a nice power band for my 2nd and 3rd gear would the 256s be better then the 260s?......also these are drop and go correct? no tuning necessary afterwords? but i know a tune would help it

also any other info would be great thanks

[jaysgottaredtop]

tomie.


is that a kids shoe brand?

[SoCalDrifter]

tomie.


is that a kids shoe brand?

actually.

its a Japanese horror film

fixed it for you thow you seemed kinda upset

[jaysgottaredtop]

yeah, super upset. after all, this is the internet.



but on a serious note, you should probably get the biggest ones they make.



because fitting your feet into kids shoes is gonna be tough.

[Mikester]

Even though there are MILES of threads on this, I will answer.

There are TWO TYPES of 260* cams made by Tomei:

1. Solid-type (upgraded valve springs highly recommended, solid lifters, reshimming of lifters/guides and minor machining needed on your rocker arms)

2. Lash-type (upgraded valve springs highly recommended, able to be used with existing lifters.

Both are already degree'd meaning that adjustable cam sprockets are not required... but a good tune will be needed to dial in the higher lift & duration.

Of course, the Tomei 256* Poncams drop right in... Nothing needed but the time to install them. Tuning for them would be even better; but this is not required unless complementing an other-than-stock tune- in your case, I would highly recommend it given that you're gonna use a 30-series turbine.

As far as what you can expect:

The 256* cams will give you better midrange response at the expense of a little less bottom-end. In otherwords; if you were to compare the power curves between stock and 256's, you will notice better power, but a more narrow & shifted to the right power curve.

260's will have the very same effect; except with an even more narrow power curve than the 256's.

I run Tomei 260 solid-type cams with a a Tomei M8270 turbine. The power feels awesome; but it comes in at about 4,500rpm or more. For my purposes, this is fine... but sometimes I miss the more 'instant' feel of my AX-53B70R with stock cams.

[SoCalDrifter]

Even though there are MILES of threads on this, I will answer.

There are TWO TYPES of 260* cams made by Tomei:

1. Solid-type (upgraded valve springs highly recommended, solid lifters, reshimming of lifters/guides and minor machining needed on your rocker arms)

2. Lash-type (upgraded valve springs highly recommended, able to be used with existing lifters.

Both are already degree'd meaning that adjustable cam sprockets are not required... but a good tune will be needed to dial in the higher lift & duration.

Of course, the Tomei 256* Poncams drop right in... Nothing needed but the time to install them. Tuning for them would be even better; but this is not required unless complementing an other-than-stock tune- in your case, I would highly recommend it given that you're gonna use a 30-series turbine.

As far as what you can expect:

The 256* cams will give you better midrange response at the expense of a little less bottom-end. In otherwords; if you were to compare the power curves between stock and 256's, you will notice better power, but a more narrow & shifted to the right power curve.

260's will have the very same effect; except with an even more narrow power curve than the 256's.

I run Tomei 260 solid-type cams with a a Tomei M8270 turbine. The power feels awesome; but it comes in at about 4,500rpm or more. For my purposes, this is fine... but sometimes I miss the more 'instant' feel of my AX-53B70R with stock cams.

cool thanks man appreciate the real answer i think im gunna go with the 256s and get a retune and if i need more ill get the 260s with some valve springs

[SoCalDrifter]

do you think going with the 256s ill be ok to run the stock valve springs once i get a retune with the cams

[steve shadows]

Have you considered the HKS 264 Step 1 or Step 2 cams? Even with the step 2 you just need upgraded valve springs. These are my favorite cams for GT30 style setups. Nice flat torque curve from 3600-7000 rpms.

[SoCalDrifter]

Have you considered the HKS 264 Step 1 or Step 2 cams? Even with the step 2 you just need upgraded valve springs. These are my favorite cams for GT30 style setups. Nice flat torque curve from 3600-7000 rpms.

havent really looked into HKS yet do you need upgraded valve springs to run step 1? as of right now i dont really wanna upgrade my valve springs even thow i know itll help i dont really have the money for them and dont have the time to rip the whole head open:/

just checked out the HKS cams dont seem to bad alittle more powerful sound nice also but there 100-130$ more then the tomei cams.......think its worth it for some reason?

[SoCalDrifter]

Have you considered the HKS 264 Step 1 or Step 2 cams? Even with the step 2 you just need upgraded valve springs. These are my favorite cams for GT30 style setups. Nice flat torque curve from 3600-7000 rpms.

did alittle more research and they dont make HKS 264 step 1 cams only step 1 is a 256 which is the same as the tomei 256s....seems like anything above a 256 requires valve springs

[Mikester]

do you think going with the 256s ill be ok to run the stock valve springs once i get a retune with the cams

256's don't require upgraded valve springs. On that note, if you don't have the money for springs, then if I were you, I'd leave well enough alone for the time being.

In your case, adding ANY cams will probably drive the need for a new tune... If you can't afford springs, then you probably can't afford a re-tune either.

Stock cams on an SR have a nice, smooth curve. Enjoy them until you have the bankroll to do it right.

[SoCalDrifter]

256's don't require upgraded valve springs. On that note, if you don't have the money for springs, then if I were you, I'd leave well enough alone for the time being.

In your case, adding ANY cams will probably drive the need for a new tune... If you can't afford springs, then you probably can't afford a re-tune either.

Stock cams on an SR have a nice, smooth curve. Enjoy them until you have the bankroll to do it right.

well i have the money i just dont really wanna blow it all on this right now gotta fix my gas tank or get a new one then i wanted to do the cams and a retune is about 100$ so thats no big deal i think im just gunna do the 256s with a retune and if i dont like it or want more ill do the valve springs in a month or so cause there another 250$-280$

[Mikester]

Cam choice isn't about 'more' or 'less'... It's about optimizing the performance characteristics of your setup... In otherwords- Getting the fattest torque curve possible with that GT30 without completely shrinking your power band or choking out the motor.

Starting to wonder if maybe your best bet is to ask your tuner what he recommends for cams since he knows your setup. Asking us internet folk; you are likely to get 100 deifferent answers... Then what?

[SoCalDrifter]

Cam choice isn't about 'more' or 'less'... It's about optimizing the performance characteristics of your setup... In otherwords- Getting the fattest torque curve possible with that GT30 without completely shrinking your power band or choking out the motor.

Starting to wonder if maybe your best bet is to ask your tuner what he recommends for cams since he knows your setup. Asking us internet folk; you are likely to get 100 deifferent answers... Then what?

ya i know i was just trying to get some feedback from what other people might have done or would have done after all the research i did alot of people said the 256s are pretty good with a nice power curve for just drop in and go instead of doing valve springs and everything but most people were using gt28s and what not didnt really find anyone with a Gt30

also ya i asked him already he said that the 264s would be alittle better then the 256s but either way the 256s r better then nothing cause were also retuning it to race gas or e85 i havent decided yet

[Mikester]

^^Well then, you may be better off waiting until you figure all that out ;)

Not saying it's right or wrong... but I chose all of that stuff before I started building. If I were in your position, it may behoove you to just get upgraded springs/retainers for now. This way, no matter what cams you choose; you'll be set.