Turbocharging the NB

Finally movement on the Turbo GT

Finally movement on the Turbo GT

Wing repair!

Wing repair!

VR gets attention

VR gets attention

Spot of Racing?

Spot of Racing?

Update time.

Couple of weeks ago a few of us decided to nip down to Santa Pod for a RWYB, we try to get a few trips in each year and seeing as the Supercharger was being removed in the coming months I thought it would be nice to see what I could run.

We found out literally the day before that Ian Blackett (Santa Pod photographer) had setup a new event called the MX5-Shootout. This event was for anything MX5 or MX5 based and had various categories to keep it competitive, this included “Anything MX5 engined” so that was me accounted for.

The morning of the event we all gathered at the local services. That Focus ST ran 13s!!!!


Arrival at Pod and we immediately signed on, Myself in the GT:

Ste in his NBFL

And Gregor in his Drift car :-)

There were a few classic at the event, this was mainly due to the following day being JapShow…This mean some serious kit was also on track.


We rowed up for our first runs, I was hoping to beat my previous best of 15.4 and spent the weekend before increasing the boost.


First run was shocking, running only just a bit faster than a naturally aspirated MX5!!!

Something felt off, max boost hit later and seemed to tail off.

I hit the queue again for another hit, this time with the computer logging the run.

Still no better, a 16.1 was hit. Knowing this car can do much better I decided to shed some weight. I do carry a full trolley jack, tools and various spares in the car so all of which was not helping.

Rowed up again…Nice GTR
This run was better, the boost came on sooner and I was off the line…..still posted a 16.2!

Back to the pit area to check under the hood, this issue had to be down to something a miss on the supercharger.

Didn’t find anything so back on track, this time I was determined to not let out and keep in it right before redline.
Tree’d the Yaris, which is to be expected but I think it only posted a 16.2 again!!!!

At this point I went to watch Gregor run and catch some footage.
As much as his car is not built for this it did look good on the track.


My turn again, and still a 16.2…After this run I decided to use the spare wheel and attempt a “Ghetto” boost leak test as the boost was tailing off and I could hear whistling noise up top.

Whilst checking the car I got chatting to another entrant in a rather quick and purposeful NB, he mentioned his car having issues on the nose wheel of the charger after I stated my boost leak checks were all fine.
Chatting through the fence.
[img style=”max-width:100%;” src=”http://img.retro-rides.org/i/v/bgtmidget7476/c1f085198360.jpg”>
I took the car over to where my friends were parked and we performed a few tests, we found that the nose wheel area of the charger was leaking boost and that the bearings were practically shot! None of which would help my times get lower like they used to be.

At this point I was still committed, either I blew the engine or the supercharger lets go I really was not bothered. We all came here to have fun and that was the aim for the rest of the day. Until…..
Doing a little “One wheel Peel” I hear a clunk, I instantly knew this was a tooth in the diff somewhere, I still ran 3-4 times after this and have since repaired the damage (it a small part of the crown wheel broken off) but still got me home ;-)

After this run all entrants were asked to attend an awards ceremony on the track itself (closed to be cleaned).
Much to my surprise I won my class!!!! Sadly not for my super low speeds or in fact because my car was fast…….But because I was the only entrant in my class!!!! Ah well Winning is Winning and I’ve never won anything.


Some serious MX5’s entered, including All Motor, Turbo/Supercharged, V8’s etc.

It’s an event I will certainly be attending again next year and with the upgrades ready to go I will be interested in how it performs.

I recorded the whole day if anyone is interested in watching, you can see it here on our channel:

If you cannot see the above, our channel name is here:

In other news:
The Turbo manifold is now finished, all associated parts are at the workshop ready to go on. Currently the plan is to strip the cars bay down over my Christmas break to install the feed lines and build the new exhaust system. I am also moving the radiator to the Rubber bumper/V8 MGB location as the current setup is not ideal for how much cooling I will require.



A new hair dryer?

A new hair dryer?

Thought I best check-in and update this.

Over the last few months the cars been in normal weekend use but during that time I’ve been getting bored of the boost, so I have been looking as upgrading the supercharger. The M65 that I fitted is pretty much at capacity on these engines and the supporting pulley mods don’t tend to bring much more to the table, with this in mine I began to hunt down bigger units to fabricate up onto the engine.

At first I saw a few Jag offerings but these would be too large, then I was offered an AMG unit for a silly cheap price but again they are a bit big for the 1.8 BP motor. I did find a rare IHI screw unit from a JDM Mazda Xedos but the nose bearing were shot and these cost more than the Supercharger itself, it was at this point I decided to go down the turbo route.

Now picking a turbo for a MX5 engine is easy, everyone picks the TD04 from a Impreza but I am not everyone. I wanted to start off with something that could offer more ChooChoo” than the M65 but would also open up future upgrades, so after some hunting and investigation I selected a T25 from a late Gen Saab. These are very cheap turbos and usually come with all the Banjo fittings and on the BP they are capable of propelling it over the 220BHP ATW, which is more than enough……For now.

Now fitting a turbo to an MX is no new thing, but fitting one to an MX engine that in a 70s BL car does open up some issues. For speed of install I wanted to just get “Off the shelf” components and bolt it right on after-all the supporting mods (ECU, Injectors, Fuel rail, Fuel Pump ect) are already in place so a map change and we are off. Things are never this easy, the aftermarket pre-made manifolds just wont work due to the inner arches being close and I am not prepared to cut these due to the current regs, so I needed to lend my hand to making a manifold……..

At first I attempted to TIG up a fully stainless system with about as equal length feeds as possible, but regardless of orientation it just would not fit. The turbo needs to be as close to the block as possible for the bonnet/exhaust components to close/fit. This means a log type manifold is the only way forward, as much as there are downsides this is never going to be a Pro-Mod.

So on with the build, you could just cut down an old manifold to then weld to but I decided to purchase a new flange:
IMG_20170507_173504 IMG_20170507_173457 IMG_20170507_164744 IMG_20170507_164345 IMG_20170507_162906 IMG_20170430_142843 - Copy IMG_20170430_154527 IMG_20170501_135448 IMG_20170427_102523 - Copy IMG_20170430_135058 - Copy IMG_20170507_150329 IMG_20170507_150319


More work – Video

More work - Video

GFBDev is changing

GFBDev is changing

Don’t worry the same old silly stuff will get built.

It’s been a long ambition of mine to push GFBDevelopments a little more, with the overall comments the BoostedGT gets and requests for items to help people boost their car I have decided to offer my fabrication as a service. At the moment we will start off small as we have identified common issues that people having when going forced induction on MX5’s etc, these same issues I also came across when boosting the GT, our plan is to have some products that will sort most of these issues and for a very low cost.

Together with this we are going to start a fully documented Turbocharger install on a NA Miata in the next few months, this install will go down the well trodden route but we will be showing how cheap this can be done even with standalone ECU’s installed.  Not only this but all the work will be done in house with the products we will have on sale, this way you can see what we are using and what they achieve

All components used will be listed as well as locations to purchase, most of which will you will be able to get direct from us made to order!

More of this to come, please be sure to follow our Facebook, Twitter and YouTube channel for more information on things to come.


Updated Video

Updated Video

Another year…another RRG

Another year...another RRG

Afternoon people of the internet.

We another year of summer shows has passed….ok, ok, the Summer is not over but most shows have been and gone.
After blowing the last engine, then replacing it and then to find the Head gasket had gone I decided to just enjoy the car during the summer months. This did mean the Supercharger install was on hold for now, which is understandable!

GFB Developments have tried to attend most shows this year, Retro Kings @ Snetterton, Retro Show @ Santa Pod and Retro Rides Gathering to name a few.
The GT has also been used as a daily and even taken on a weeks holiday to Devon, it also performed faultlessly and took the 500 Mile round trip totally in it’s stride. It is of course why we put a modernish lump in it.

So as the summer draws to a close, the winter months kick in and I intend to use them to complete this Charger install once and for all!
I guess you are wondering about the other motors?? Well the Capri was MOT’d then parked back in the garage (A waste I know but the summer has been just too wet). The beetle…erm, Yeah it drove around the garden ONCE then broke down…But it’s a project and that is what happens when they stall I guess. The same can be said for the Austin, which decided it would not like to start a few months back, so she’s again on the back burner.

The Passat is still in daily use, as is the MX5 but this has changed a little…including being destroyed/swapped/rewired.
There is a new member to welcome to fold including a new motor, but more on this when we actually see it.


More later.