RND Motorsport

RND Motorsport RND Motorsport

12/06/2026

Next challenge for the week coming straight up GTX Corsa D Z16 looking for some nice usable power without bending the crank !

Anyone who knows the Z16 engine , also knows that it can only take a certain amount of torque before the crank develops itself into a bendy one . Keeping the torque down to a certain level is key , having the boost under control properly is a big part of this - one decent flare up in boost through the mid range and this engine will be done.

So we do what we do , start low boost and just make lots and lots of small changes till we are happy . Absolute maximum power was not the goal here , a nice usable power band with good drivability on an engine built by one of our previous customers .

The z16 engine takes a big turbo nicely , truth be told the cylinder head on the z16 is actually very good at flowing the air higher up in the RPMS - the inlet ports are substantially bigger than a z20 engine and this helps a lot !

Finally calibrated and pulling nearly 370 HP we were happy that this car would now feel a bit faster than the 200hp our customer was used to 😁

This week has been a run of spicy blue ones all now running nicely and some happy customers enjoying what they built 😎

12/06/2026

We love a challenge here , every day is different , you never really know what is going to get thrown at you tuning wise till its strapped down on the dyno and we have some data .

This customer came to us after having a new forged engine built , his engine builder said straight away there is something not right with that tune , it needs mapping ASAP - He was right !

We strapped it down and got a baseline of where it was at - a claimed 340 HP rolled 335 on ours but it was impressive for all the wrong reasons .

the map it arrived on was so lean , running this hard on the road would have ended it in short order - the fuelling never went any richer than 13;1 AFR , quite wild considering the turbo was also at 35 PSI of boost !!!!!!

At the top the power died off , not down to the usual throttle close that a lot of tuners get , the turbo had been pushed that hard that it got to a certain point and just stalled , and boost just dropped in an instant .

We were never going to match 35 PSI of boost on a hybrid ko4 with VXR injectors but we were going to do our best to get this thing running as much power as we could find safely . Taking the injectors to the maximum we know they will run at was clearly going to be our limit here !

Settling for a nice flat 11-8 AFR in boost , 20 PSI peak boost , over 15 psi down in boost pressure from where it was .................... 4 hours later we had a power curve that looked much more sane to us !

Now this thing is safe to run flat out on the new engine to get that settled in nicely before the big turbo arrives , next time we see this car we should be seeing an extra 200 HP on top 😎

29/05/2026

From shearing a crank key to be now running a full fresh V2 engine install 👊.

Dyno break in . When built right you need to put some load on the engine to get it to scrub in properly . Half a bar of boost and wide open throttle , being able to change the tune to suit running an engine in is a big part of how the end result lands . We also constantly gather data for the final tune too 👌

Rinse and repeat this till the blow by gas comes down properly , all done in a controlled environment , get onto the constant load and we will have this thing back at full power ✌️

I mean to say this is supposed to be a “built” gearbox . Just let the pictures do the talking I mean what do you even sa...
26/05/2026

I mean to say this is supposed to be a “built” gearbox . Just let the pictures do the talking

I mean what do you even say about the state of this really .

It’s actually in worse condition than we usually see but at least this one has not had a grinder through the casing to get the bearings out 🙄.

So we do what we do , start again , do it right and give this customer some trouble free use in his toy .

When a gearbox has more silicone hanging out of it than a insta hoe , just walk away 🤣 . Little bit in the right place is orite tho , we are on about the gearbox 👀👀🤙.

Back from the bank holiday weekend and flat out straight away 🫡.

Picture dump of the last rescue mission - from shearing the woodruff key to being wedged , bored , honed , forged and r...
21/05/2026

Picture dump of the last rescue mission - from shearing the woodruff key to being wedged , bored , honed , forged and rebuilt - This is what the bottom end now looks like .

Putting a decent Z20 engine together is something we can do easy , each one goes through the same process every time - if we have an issue we change the process , learn and go forward. The parts we use in all our engines are selected for good reasons - why do we use the same parts over and over ? Because they never let us down !

The last step for this engine is to get it back in the car and get it running and broken in - after that we get to lay the power curves over each other and show our customer exactly how much better the new engine really is.

Job satisfaction running at maximum level this week 😎

Some reminders for people 🫡Firstly , to get in contact with us now we no longer have a phone line , email or message dir...
19/05/2026

Some reminders for people 🫡

Firstly , to get in contact with us now we no longer have a phone line , email or message direct on here are the only options - as always reply’s will be given when we have time to do so , mostly on an evening . Email on the addresses below

[email protected]
[email protected]
[email protected]

Secondly - torque your main crank bolt up properly . It’s much cheaper to do that right first time but we can build you a solid replacement should things go wrong 🫣

✌️

11/05/2026

Nice to finally get this customer up and running making some power

We are pretty much bang on target here , having proved that there was some power in this setup we could have finished probably over the 500HP mark but a couple of fuelling issues on along the way left us a little suspicions on the fuelling setup .

Having the confidence that the car is fully ready for top power is a thing , we wont just push your car to post up online HP figures for the sake of it , we will tune your car to where we feel safe tuning it to - having the customer explicitly tell you to send it is also a thing that suits some better than others !

this is where we felt safe tuning the car too and hopefully our customer will have no issues running it flat out. Possibly more power in the future or just a good solid setup where its at currently , 480+ hp is not exactly slow by any standard .

14 hour round trip for the customer , long day on the dyno for us but a good result and hopefully no dramas from this car 😎

01/05/2026

The first few moments of any decent engines life is crucial. Getting this wrong will lead to all sorts of issues down the line.

Engine break in is something that needs to be done properly , making sure the load is not to light or also too heavy , using the engine in the right speed range and also keeping an eye out on the data 👊.

We don’t usually do bikes but we made an exception for this one

Serious machines need serious work , that’s what we are here for 🤙

01/05/2026

Another program ticked off the list for the spicy z20 heads . No more hand grinding the extra cam clearance 🤙

28/04/2026

Adam Marshall Racing - air management sorted for the next round , no more overheating and hopefully a little more rear end grip 🤙

Address

RnD Motorsport, 5 Tholthorpe Business Park, Tholthorpe
York
YO611SS

Opening Hours

Monday 10am - 2pm
Tuesday 10am - 2pm
Wednesday 10am - 2pm
Thursday 10am - 2pm
Friday 10am - 2pm

Telephone

+441347838174

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