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So, next step. Adding Vtec to my d14.
I`m planning to put a d16z6 head on my d14, so i get vtec.
But i have already turbo on it. In jan/feb i will get a dyno, but till then i dont now the HP.

Whats your opinion, can the stock d14 handle turbo and vtec?
I`ve heard that because with the d16z6 head the torq in the higher revs will nog increase, it should be oke.

First of all how much are you planning to do with your engine? I would suggest you add some new vitara pistons which you can find for almost 100 USD. They can handle a lot of psi. The vtec system will make it more friendly to lower and mid revs. Tell us a bit about your budget. If you go turbo i don't find the vtec conversion very useful.

I already have turbo. With the vtec the power range below will increase a lot.

saxophonias wrote:I would suggest you add some new vitara pistons which you can find for almost 100 USD. They can handle a lot of psi.

These pistons what rods need to work?

if your looking for lots of power you dont need VTEC. It just increases driveability, i.e you can have a semi fast car, but also easy to drive/economic.

If you want increase your boost then dont bother with VTEC just make sure your rods and pistons can take the boost.

If you want to keep the same boost and then add VTEC then go for it but i wouldnt expect a big difference

BETEK wrote:

saxophonias wrote:I would suggest you add some new vitara pistons which you can find for almost 100 USD. They can handle a lot of psi.

These pistons what rods need to work?

we have to look it up! vitara pistons are a straight swap for d15. We have to calculate the height with the d14 stock rods. the vitara pistons give a c/r of 8 aprox. I think we can use d13 rods right? And there must be aftermarket stonger rods. Crower if i am right.

I personally think VTEC +boost is ideal to get the most hp of your car without building the entire block.

The D16Z6 head will hardly increase CR.. I suppose 9.3 or 9.4 when you don't mill it. From me you know with stock ESi cam you can get close to 140 bhp, in my case 137 without spending big sums.

It is known stock D14 with stock compression can handle 0.5 bar or around 7/8 PSi... most turbo kits are around these numbers. Increasing peak torque around 50% from stock.

Combining both will give a pretty safe combination that can get you over 200 bhp (look at Sebastix). Personally, 200 bhp is more than enough, with the easy torque a turbo delivers you get a brilliant car, given things stay in one piece. Btw do use 98 octane fuel for safety please.

But anyway, my point is, I've proven rods can handle VTEC rpms easy in the D14, others have proven rods can cope with 0.5 bar... and increasing rpm does not increase compression stresses, or hardly on the rods. As long as temperatures stay normal...

Otherwise one could argue that I should do the same, slam a 0.5 bar turbo setup on my setup, gives the same result. I wont for the sake of N/A curiousity, but I believe a D14 turbo VTEC without expensive rebuild could give a really big smile on your face, and be reliable for years if done properly.

Got a wideband AFR btw?

Thanks for the attention everybody!

First of all, i knof that if i want more top hp the easy`st thing to do is turn up the boost. But like you guys already sayd, i have to take my engine apart then. Now, because its a relative big turbo, i got boost from 4k rpm. With the d16z6, i think im running easy`r to that point, so faster boost = faster 0-100.

Now somebody told me that if i changed my underengine (dont now how its called in english) with a d16y7 (wich are cheap), i could turn up the boost. Do someone got more info about that?

A stock D14 bottem end is wayyy better then a stock y7 bottem end.
Mainly because the Y serie engines use the low/bad oil pump and are known to trow bearings even in stock use .This could be solved by porting the oil pump.I think the Stock D14 bottem end can handle more boost then that crappy y7 bottem end.The D14 could handle more with stock rods If you would replace the stock rod bolts with Arp rod bolts and port the D14 oil pump .Tuning is also a big key factor with holding or breaking your engine.

hondaNickx wrote:A stock D14 bottem end is wayyy better then a stock y7 bottem end.
Mainly because the Y serie engines use the low/bad oil pump and are known to trow bearings even in stock use .This could be solved by porting the oil pump.I think the Stock D14 bottem end can handle more boost then that crappy y7 bottem end.The D14 could handle more with stock rods If you would replace the stock rod bolts with Arp rod bolts and port the D14 oil pump .Tuning is also a big key factor with holding or breaking your engine.

interessting x)