GR Yaris Expected Power Gains?

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shogunzac

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I use my Gr Yaris Circuit (UK) as a daily driver, it currently has Cat Back non-Res exhaust.
Everything else is stock.
At the weekend I am having:
Litchfield ECU re-map
Kelford Camshafts (EZ)
Kelford Valve Springs/Retainers
Open MST Air intake

Installed.

I'm thinking this should take the power to 350/360bhp, am I wrong?
Would the (EZ) Camshafts be the best ones for me? I only want to track it a couple of times a year, when I do I will add Oil Cooler and Intercooler.
If eventually I want to add more power in terms of a Hybrid Turbo and Injectors, would sticking with the (EZ) Camshafts still be a good idea?
 
Without HJS cat and IC id say youre in 330-340 ballpark but just guessing. You would likely gain 20-30 with them installed?

Nice setup still, fun to see where the figures land!
 
shogunzac said:
I use my Gr Yaris Circuit (UK) as a daily driver, it currently has Cat Back non-Res exhaust.
Everything else is stock.
At the weekend I am having:
Litchfield ECU re-map
Kelford Camshafts (EZ)
Kelford Valve Springs/Retainers
Open MST Air intake

Installed.

I'm thinking this should take the power to 350/360bhp, am I wrong?
Would the (EZ) Camshafts be the best ones for me? I only want to track it a couple of times a year, when I do I will add Oil Cooler and Intercooler.
If eventually I want to add more power in terms of a Hybrid Turbo and Injectors, would sticking with the (EZ) Camshafts still be a good idea?
Click to expand...
If your car should still be able to idle, stick to EZ.
350/360hp needs a LOT of boost. I would guess, you‘ll be looking at an honest 320-330hp.

Attached is a graph of a GR we just mapped without an OPF, sports cat and MST Intake, without cams and springs.
To achieve this we needed ~1.8bar boost.
The EZ, and especially the valvesprings, won‘t give you much more power. Just more safety.
And the EZ don‘t really work with just a remap. They need additional tuning to work properly.

Unless you‘re willing to run a sports cat. and 2.0 bar boost or more, you won‘t be able to achieve the 350-360hp.

1DBAD75B-3B89-48BE-826C-763401136FDC.webp
 
shogunzac said:
I use my Gr Yaris Circuit (UK) as a daily driver, it currently has Cat Back non-Res exhaust.
Everything else is stock.
At the weekend I am having:
Litchfield ECU re-map
Kelford Camshafts (EZ)
Kelford Valve Springs/Retainers
Open MST Air intake

Installed.

I'm thinking this should take the power to 350/360bhp, am I wrong?
Would the (EZ) Camshafts be the best ones for me? I only want to track it a couple of times a year, when I do I will add Oil Cooler and Intercooler.
If eventually I want to add more power in terms of a Hybrid Turbo and Injectors, would sticking with the (EZ) Camshafts still be a good idea?
Click to expand...
Keep us informed of your result ! :)
 
pardon my OT jargon but given all dynos are different, it is all very speculative but some tuners do have rather optimistic sales hp's.
prefer lower and reliable numbers, as what do you do with a dyno queen charts that maybe work once for 20s pull..
Even and big numbers are nice but better to target on reliable performance - it wins, every time.
 
Kelford have claimed figures of 30bhp on the EZ but I'm unsure on what map or boost they are referring to... also I have gone onto their site recently and they have changed what they have said on the EZ :cautious: Now it just says "Easy power drop in cams"...........
I'll keep you all posted with the results, thanks people (y)
 
I would just go for the springs.
I had the kelford cams put in which gave 10lb less torque and only a power increase over 6000 rpm.
I was running 350hp before cams now 363hp.
Sports cat,opf delete,evneturi, litchfield tune.
 
WRC6165 said:
I would just go for the springs.
I had the kelford cams put in which gave 10lb less torque and only a power increase over 6000 rpm.
I was running 350hp before cams now 363hp.
Sports cat,opf delete,evneturi, litchfield tune.
Click to expand...
Which ones did you have fitted pal? A, B, C or EZ?
 
I get your point ;)
I am old school and like the torque.
I had a yellow Honda EK9 before and didn't enjoy reving the nuts out of it to get the power:ROFLMAO: but the Yaris does have more than enough.
One plus for having the Kelfod cams is that Fensport did have a lobe move on the original cams?
 
WRC6165 said:
I get your point ;)
I am old school and like the torque.
I had a yellow Honda EK9 before and didn't enjoy reving the nuts out of it to get the power:ROFLMAO: but the Yaris does have more than enough.
One plus for having the Kelfod cams is that Fensport did have a lobe move on the original cams?
Click to expand...
I'm at a loss as to how a cam lobe can move?
 
shogunzac said:
I use my Gr Yaris Circuit (UK) as a daily driver, it currently has Cat Back non-Res exhaust.
Everything else is stock.
At the weekend I am having:
Litchfield ECU re-map
Kelford Camshafts (EZ)
Kelford Valve Springs/Retainers
Open MST Air intake

Installed.

I'm thinking this should take the power to 350/360bhp, am I wrong?
Would the (EZ) Camshafts be the best ones for me? I only want to track it a couple of times a year, when I do I will add Oil Cooler and Intercooler.
If eventually I want to add more power in terms of a Hybrid Turbo and Injectors, would sticking with the (EZ) Camshafts still be a good idea?
Click to expand...
So?
How did it turn out?
 
Phil1291 said:
They‘re not made from a single billet part, but the lobes are put on the shaft. Don‘t know the correct word in english.
You‘d have to google it how its done. 😅
Click to expand...
Lobes are press fitted, mounted either with brute force or by heating the lobes and cooling the shaft, or both.
 
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